Steven J. Ray, Ph.D. - Publications

Affiliations: 
2004 Indiana University, Bloomington, Bloomington, IN, United States 
Area:
basic mechanisms in atomic emission, absorption, fluorescence and mass spectrometric analysis, and the development of instrumentation and techniques for atomic methods of analysis

75 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2020 Brais CJ, Ibañez JO, Schwartz AJ, Ray SJ. RECENT ADVANCES IN INSTRUMENTAL APPROACHES TO TIME-OF-FLIGHT MASS SPECTROMETRY. Mass Spectrometry Reviews. PMID 32779281 DOI: 10.1002/Mas.21650  0.461
2020 Rivera-Albarran ME, Ray S. A Novel Combined Microstrip Resonator/NanoSpray Ionization Source for Microwave-Assisted Trypsin Digestion of Proteins. Journal of the American Society For Mass Spectrometry. PMID 32573245 DOI: 10.1021/Jasms.0C00115  0.367
2017 Zeiri OM, Storey AP, Ray SJ, Hieftje GM. Microplasma-based flowing atmospheric-pressure afterglow (FAPA) source for ambient desorption-ionization mass spectrometry. Analytica Chimica Acta. 952: 1-8. PMID 28010838 DOI: 10.1016/J.Aca.2016.10.042  0.648
2016 Storey AP, Ray SJ, Hoffmann V, Voronov M, Engelhard C, Buscher W, Hieftje GM. Wavelength Scanning with a Tilting Interference Filter for Glow-Discharge Elemental Imaging. Applied Spectroscopy. PMID 27872218 DOI: 10.1177/0003702816680001  0.54
2016 Storey AP, Zeiri OM, Ray SJ, Hieftje GM. Use of Interrupted Helium Flow in the Analysis of Vapor Samples with Flowing Atmospheric-Pressure Afterglow-Mass Spectrometry. Journal of the American Society For Mass Spectrometry. PMID 27757823 DOI: 10.1007/S13361-016-1520-Z  0.603
2016 Cheung Y, Ray SJ, Schwartz AJ, Hieftje GM. Use of Gradient Dilution to Detect and Correct Matrix Interferences in Inductively Coupled Plasma-Time-of-Flight Mass Spectrometry. Applied Spectroscopy. PMID 27680086 DOI: 10.1177/0003702816661727  0.814
2016 Dennis EA, Gundlach-Graham AW, Ray SJ, Enke CG, Hieftje GM. Distance-of-Flight Mass Spectrometry: What, Why, and How? Journal of the American Society For Mass Spectrometry. PMID 27562501 DOI: 10.1007/S13361-016-1458-1  0.629
2016 Schwartz AJ, Ray SJ, Hieftje GM. Evaluation of interference filters for spectral discrimination in solution-cathode glow discharge optical emission spectrometry Journal of Analytical Atomic Spectrometry. 31: 1278-1286. DOI: 10.1039/C6Ja00127K  0.511
2016 Cheung Y, Ray SJ, Hieftje GM. Detection and correction of matrix interference in inductively coupled plasma-time of flight mass spectrometry by means of aerosol dispersion Journal of Analytical Atomic Spectrometry. 31: 1542-1548. DOI: 10.1039/C6Ja00022C  0.814
2016 Schwartz AJ, Cheung Y, Jevtic J, Pikelja V, Menon A, Ray SJ, Hieftje GM. New inductively coupled plasma for atomic spectrometry: The microwave-sustained, inductively coupled, atmospheric-pressure plasma (MICAP) Journal of Analytical Atomic Spectrometry. 31: 440-449. DOI: 10.1039/C5Ja00418G  0.797
2016 Storey AP, Ray SJ, Hoffmann V, Voronov M, Engelhard C, Buscher W, Hieftje GM. Emergence and consequences of lateral sample heterogeneity in glow discharge spectrometry Spectrochimica Acta Part B: Atomic Spectroscopy. 126: 37-43. DOI: 10.1016/J.Sab.2016.10.012  0.573
2016 Schwartz AJ, Ray SJ, Chan GC, Hieftje GM. Spatially resolved measurements to improve analytical performance of solution-cathode glow discharge optical-emission spectrometry Spectrochimica Acta Part B: Atomic Spectroscopy. 125: 168-176. DOI: 10.1016/J.Sab.2016.10.004  0.547
2015 Saha-Shah A, Weber AE, Karty JA, Ray SJ, Hieftje GM, Baker LA. Nanopipettes: probes for local sample analysis. Chemical Science. 6: 3334-3341. PMID 28706697 DOI: 10.1039/C5Sc00668F  0.533
2015 Dennis EA, Ray SJ, Enke CG, Hieftje GM. Inductively Coupled Plasma Zoom-Time-of-Flight Mass Spectrometry. Journal of the American Society For Mass Spectrometry. PMID 26634932 DOI: 10.1007/S13361-015-1309-5  0.639
2015 Dennis EA, Ray SJ, Enke CG, Gundlach-Graham AW, Barinaga CJ, Koppenaal DW, Hieftje GM. Distance-of-Flight Mass Spectrometry with IonCCD Detection and an Inductively Coupled Plasma Source. Journal of the American Society For Mass Spectrometry. PMID 26552388 DOI: 10.1007/S13361-015-1295-7  0.689
2015 Saha-Shah A, Weber AE, Karty JA, Ray SJ, Hieftje GM, Baker LA. Nanopipettes: Probes for local sample analysis Chemical Science. 6: 3334-3341. DOI: 10.1039/c5sc00668f  0.395
2015 Storey AP, Zeiri OM, Ray SJ, Hieftje GM. Helium conservation by discontinuous introduction in the flowing atmospheric-pressure afterglow source for ambient desorption-ionization mass spectrometry Journal of Analytical Atomic Spectrometry. 30: 2017-2023. DOI: 10.1039/C5Ja00228A  0.607
2015 Gundlach-Graham A, Dennis EA, Ray SJ, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. Laser-ablation sampling for inductively coupled plasma distance-of-flight mass spectrometry Journal of Analytical Atomic Spectrometry. 30: 139-147. DOI: 10.1039/C4Ja00231H  0.618
2015 Schwartz AJ, Ray SJ, Hieftje GM. Automatable on-line generation of calibration curves and standard additions in solution-cathode glow discharge optical emission spectrometry Spectrochimica Acta - Part B Atomic Spectroscopy. 105: 77-83. DOI: 10.1016/J.Sab.2014.08.035  0.54
2014 Orejas J, Pfeuffer KP, Ray SJ, Pisonero J, Sanz-Medel A, Hieftje GM. Effect of internal and external conditions on ionization processes in the FAPA ambient desorption/ionization source. Analytical and Bioanalytical Chemistry. 406: 7511-21. PMID 25178932 DOI: 10.1007/S00216-014-8088-X  0.629
2014 Ray SJ, Pereiro R. Emerging concepts and strategies in analytical glow discharges. Analytical and Bioanalytical Chemistry. 406: 7417-8. PMID 25134674 DOI: 10.1007/S00216-014-8096-X  0.474
2014 Pfeuffer KP, Caldwell J, Shelley JT, Ray SJ, Hieftje GM. Detection of counterfeit electronic components through ambient mass spectrometry and chemometrics. The Analyst. 139: 4505-11. PMID 25054911 DOI: 10.1039/C4An01071J  0.739
2014 Dennis EA, Gundlach-Graham AW, Ray SJ, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. Zoom-TOFMS: addition of a constant-momentum-acceleration "zoom" mode to time-of-flight mass spectrometry. Analytical and Bioanalytical Chemistry. 406: 7419-30. PMID 24866712 DOI: 10.1007/S00216-014-7875-8  0.636
2014 Pfeuffer KP, Ray SJ, Hieftje GM. Measurement and visualization of mass transport for the flowing atmospheric pressure afterglow (FAPA) ambient mass-spectrometry source. Journal of the American Society For Mass Spectrometry. 25: 800-8. PMID 24658804 DOI: 10.1007/S13361-014-0843-X  0.65
2014 Voronov M, Hoffmann V, Steingrobe T, Buscher W, Engelhard C, Storey AP, Ray SJ, Hieftje GM. Spot patterns and instabilities in a pulsed low-pressure rf glow discharge Plasma Sources Science and Technology. 23. DOI: 10.1088/0963-0252/23/5/054009  0.546
2013 Dennis EA, Ray SJ, Gundlach-Graham AW, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. Constant-momentum acceleration time-of-flight mass spectrometry with energy focusing. Journal of the American Society For Mass Spectrometry. 24: 1853-61. PMID 24081835 DOI: 10.1007/S13361-013-0723-9  0.596
2013 Gundlach-Graham A, Dennis EA, Ray SJ, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. Interleaved Distance-of-Flight Mass Spectrometry: A Simple Method to Improve the Instrument Duty Factor. Journal of the American Society For Mass Spectrometry. 24: 1736-44. PMID 23982936 DOI: 10.1007/S13361-013-0718-6  0.617
2013 Yuill EM, Sa N, Ray SJ, Hieftje GM, Baker LA. Electrospray ionization from nanopipette emitters with tip diameters of less than 100 nm. Analytical Chemistry. 85: 8498-502. PMID 23968307 DOI: 10.1021/Ac402214G  0.571
2013 Pfeuffer KP, Schaper JN, Shelley JT, Ray SJ, Chan GC, Bings NH, Hieftje GM. Halo-shaped flowing atmospheric pressure afterglow: a heavenly design for simplified sample introduction and improved ionization in ambient mass spectrometry. Analytical Chemistry. 85: 7512-8. PMID 23808829 DOI: 10.1021/Ac401524X  0.83
2013 Dennis EA, Gundlach-Graham AW, Enke CG, Ray SJ, Carado AJ, Barinaga CJ, Koppenaal DW, Hieftje GM. How constant momentum acceleration decouples energy and space focusing in distance-of-flight and time-of-flight mass spectrometries. Journal of the American Society For Mass Spectrometry. 24: 690-700. PMID 23526167 DOI: 10.1007/S13361-013-0587-Z  0.555
2013 Schwartz AJ, Wang Z, Ray SJ, Hieftje GM. Universal anion detection by replacement-ion chromatography with an atmospheric-pressure solution-cathode glow discharge photometric detector. Analytical Chemistry. 85: 129-37. PMID 23157551 DOI: 10.1021/Ac3022554  0.595
2013 Gundlach-Graham A, Dennis EA, Ray SJ, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. First inductively coupled plasma-distance-of-flight mass spectrometer: Instrument performance with a microchannel plate/phosphor imaging detector Journal of Analytical Atomic Spectrometry. 28: 1385-1395. DOI: 10.1039/C3Ja50122A  0.659
2013 Pfeuffer KP, Shelley JT, Ray SJ, Hieftje GM. Visualization of mass transport and heat transfer in the FAPA ambient ionization source Journal of Analytical Atomic Spectrometry. 28: 379-387. DOI: 10.1039/C3Ja30353E  0.777
2013 Wang Z, Schwartz AJ, Ray SJ, Hieftje GM. Determination of trace sodium, lithium, magnesium, and potassium impurities in colloidal silica by slurry introduction into an atmospheric-pressure solution-cathode glow discharge and atomic emission spectrometry Journal of Analytical Atomic Spectrometry. 28: 234-240. DOI: 10.1039/C2Ja30253E  0.541
2012 Schwartz AJ, Ray SJ, Elish E, Storey AP, Rubinshtein AA, Chan GC, Pfeuffer KP, Hieftje GM. Visual observations of an atmospheric-pressure solution-cathode glow discharge. Talanta. 102: 26-33. PMID 23182571 DOI: 10.1016/J.Talanta.2012.07.096  0.688
2012 Gundlach-Graham AW, Dennis EA, Ray SJ, Enke CG, Carado AJ, Barinaga CJ, Koppenaal DW, Hieftje GM. Extension of the focusable mass range in distance-of-flight mass spectrometry with multiple detectors. Rapid Communications in Mass Spectrometry : Rcm. 26: 2526-34. PMID 23008070 DOI: 10.1002/Rcm.6379  0.621
2012 Enke CG, Ray SJ, Graham AW, Dennis EA, Hieftje GM, Carado AJ, Barinaga CJ, Koppenaal DW. Distance-of-flight mass spectrometry: a new paradigm for mass separation and detection. Annual Review of Analytical Chemistry (Palo Alto, Calif.). 5: 487-504. PMID 22524227 DOI: 10.1146/Annurev-Anchem-091411-121050  0.62
2012 Voronov M, Hoffmann V, Buscher W, Engelhard C, Ray SJ, Hieftje GM. Thermal mechanism for formation of electrical prepeak and pressure waves in a microsecond direct current pulsed glow discharge with a Grimm-type source: A modeling investigation Journal of Analytical Atomic Spectrometry. 27: 1225-1233. DOI: 10.1039/C2Ja30014A  0.499
2012 Voronov M, Hoffmann V, Wallendorf T, Marke S, Mönch J, Engelhard C, Buscher W, Ray SJ, Hieftje GM. Glow discharge imaging spectroscopy with a novel acousto-optical imaging spectrometer Journal of Analytical Atomic Spectrometry. 27: 419-425. DOI: 10.1039/C2Ja10325G  0.487
2012 Gamez G, Voronov M, Ray SJ, Hoffmann V, Hieftje GM, Michler J. Surface elemental mapping via glow discharge optical emission spectroscopy Spectrochimica Acta - Part B Atomic Spectroscopy. 70: 1-9. DOI: 10.1016/J.Sab.2012.04.007  0.701
2011 Graham AW, Ray SJ, Enke CG, Felton JA, Carado AJ, Barinaga CJ, Koppenaal DW, Hieftje GM. Resolution and mass range performance in distance-of-flight mass spectrometry with a multichannel focal-plane camera detector. Analytical Chemistry. 83: 8552-9. PMID 21972781 DOI: 10.1021/ac201876y  0.571
2011 Graham AW, Ray SJ, Enke CG, Barinaga CJ, Koppenaal DW, Hieftje GM. First distance-of-flight instrument: opening a new paradigm in mass spectrometry. Journal of the American Society For Mass Spectrometry. 22: 110-7. PMID 21472549 DOI: 10.1007/S13361-010-0005-8  0.645
2011 Voronov M, Hoffmann V, Buscher W, Engelhard C, Ray SJ, Hieftje GM. Pressure waves generated in a Grimm-type pulsed glow discharge source and their influence on discharge parameters Journal of Analytical Atomic Spectrometry. 26: 811-815. DOI: 10.1039/C0Ja00182A  0.521
2011 Felton JA, Schilling GD, Ray SJ, Sperline RP, Denton MB, Barinaga CJ, Koppenaal DW, Hieftje GM. Evaluation of a fourth-generation focal plane camera for use in plasma-source mass spectrometry Journal of Analytical Atomic Spectrometry. 26: 300-304. DOI: 10.1039/C0Ja00087F  0.838
2010 Rogers DA, Ray SJ, Hieftje GM. An electrospray/inductively coupled plasma dual-source time-of-flight mass spectrometer for rapid metallomic and speciation analysis. Part 2. Atomic channel and dual-channel characterization. Metallomics : Integrated Biometal Science. 2: 280-8. PMID 21069170 DOI: 10.1039/B915783B  0.745
2010 Rogers DA, Ray SJ, Hieftje GM. An electrospray/inductively coupled plasma dual-source time-of-flight mass spectrometer for rapid metallomic and speciation analysis. Part 1. Molecular channel characterization. Metallomics : Integrated Biometal Science. 2: 271-9. PMID 21069169 DOI: 10.1039/B915782D  0.759
2010 Engelhard C, Ray SJ, Buscher W, Hoffmann V, Hieftje GM. Correcting distortion in a monochromatic imaging spectrometer for application to elemental imaging by glow discharge-optical emission spectrometry Journal of Analytical Atomic Spectrometry. 25: 1874-1881. DOI: 10.1039/C0Ja00068J  0.483
2010 Rogers DA, Ray SJ, Hieftje GM. Use of a nano-electrospray/inductively coupled plasma dual-source time-of-flight mass spectrometer for chromium speciation Journal of Analytical Atomic Spectrometry. 25: 62-73. DOI: 10.1039/B918622K  0.762
2010 Schilling GD, Ray SJ, Sperline RP, Denton MB, Barinaga CJ, Koppenaal DW, Hieftje GM. Optimization of Ag isotope-ratio precision with a 128-channel array detector coupled to a mattauch-herzog mass spectrograph Journal of Analytical Atomic Spectrometry. 25: 322-327. DOI: 10.1039/B914052B  0.804
2010 Rubinshtein AA, Schilling GD, Ray SJ, Sperline RP, Denton MB, Barinaga CJ, Koppenaal DW, Hieftje GM. Characterization of a third-generation Faraday-strip array detector coupled to a Mattauch-Herzog geometry mass spectrograph with a dc-glow discharge ionization source Journal of Analytical Atomic Spectrometry. 25: 735-738. DOI: 10.1039/B913118C  0.829
2009 Schilling GD, Ray SJ, Rubinshtein AA, Felton JA, Sperline RP, Denton MB, Barinaga CJ, Koppenaal DW, Hieftje GM. Evaluation of a 512-channel Faraday-strip array detector coupled to an inductively coupled plasma Mattauch-Herzog mass spectrograph. Analytical Chemistry. 81: 5467-73. PMID 19462968 DOI: 10.1021/Ac900640M  0.814
2009 Shelley JT, Wiley JS, Chan GC, Schilling GD, Ray SJ, Hieftje GM. Characterization of direct-current atmospheric-pressure discharges useful for ambient desorption/ionization mass spectrometry. Journal of the American Society For Mass Spectrometry. 20: 837-44. PMID 19185515 DOI: 10.1016/J.Jasms.2008.12.020  0.805
2009 Rogers DA, Ray SJ, Hieftje GM. An electrospray/inductively coupled plasma dual-source time-of-flight mass spectrometer for rapid metallomic and speciation analysis: Instrument design Metallomics. 1: 67-77. DOI: 10.1039/B816732J  0.772
2008 Zhu Z, Chan GC, Ray SJ, Zhang X, Hieftje GM. Microplasma source based on a dielectric barrier discharge for the determination of mercury by atomic emission spectrometry. Analytical Chemistry. 80: 8622-7. PMID 18937424 DOI: 10.1021/Ac801531J  0.726
2008 Shelley JT, Ray SJ, Hieftje GM. Laser ablation coupled to a flowing atmospheric pressure afterglow for ambient mass spectral imaging. Analytical Chemistry. 80: 8308-13. PMID 18826246 DOI: 10.1021/Ac801594U  0.782
2008 Zhu Z, Chan GC, Ray SJ, Zhang X, Hieftje GM. Use of a solution cathode glow discharge for cold vapor generation of mercury with determination by ICP-atomic emission spectrometry. Analytical Chemistry. 80: 7043-50. PMID 18710258 DOI: 10.1021/Ac8011126  0.701
2008 Andrade FJ, Shelley JT, Wetzel WC, Webb MR, Gamez G, Ray SJ, Hieftje GM. Atmospheric pressure chemical ionization source. 2. Desorption-ionization for the direct analysis of solid compounds. Analytical Chemistry. 80: 2654-63. PMID 18345694 DOI: 10.1021/Ac800210S  0.808
2008 Andrade FJ, Shelley JT, Wetzel WC, Webb MR, Gamez G, Ray SJ, Hieftje GM. Atmospheric pressure chemical ionization source. 1. Ionization of compounds in the gas phase. Analytical Chemistry. 80: 2646-53. PMID 18345693 DOI: 10.1021/Ac800156Y  0.811
2007 Gamez G, Ray SJ, Andrade FJ, Webb MR, Hieftje GM. Development of a pulsed radio frequency glow discharge for three-dimensional elemental surface imaging. 1. Application to biopolymer analysis. Analytical Chemistry. 79: 1317-26. PMID 17243768 DOI: 10.1021/Ac061361L  0.78
2006 Szumlas AW, Ray SJ, Hieftje GM. Hadamard transform ion mobility spectrometry. Analytical Chemistry. 78: 4474-81. PMID 16808456 DOI: 10.1021/ac051743b  0.493
2006 Andrade FJ, Wetzel WC, Chan GCY, Webb MR, Gamez G, Ray SJ, Hieftje GM. A new, versatile, direct-current helium atmospheric-pressure glow discharge Journal of Analytical Atomic Spectrometry. 21: 1175-1184. DOI: 10.1039/B607544D  0.776
2004 Ray SJ, Andrade F, Gamez G, McClenathan D, Rogers D, Schilling G, Wetzel W, Hieftje GM. Plasma-source mass spectrometry for speciation analysis: state-of-the-art. Journal of Chromatography. A. 1050: 3-34. PMID 15503923 DOI: 10.1016/J.Chroma.2004.07.107  0.8
2004 McClenathan DM, Ray SJ, Wetzel WC, Hieftje GM. Peer Reviewed: Plasma Source TOFMS Analytical Chemistry. 76: 158 A-166 A. DOI: 10.1021/Ac0415509  0.769
2002 Hieftje G, Huang M, Lehn S, Warner K, Gamez G, Ray S, Leach A. Toward a fuller understanding of analytical atomic spectrometry. Analytical Sciences : the International Journal of the Japan Society For Analytical Chemistry. 18: 1185-9. PMID 12458700 DOI: 10.2116/Analsci.18.1185  0.811
2001 Hieftje GM, Barnes JH, Grøn OA, Leach AM, McClenathan DM, Ray SJ, Solyom DA, Wetzel WC, Denton MB, Koppenaal DW. Evolution and revolution in instrumentation for plasma-source mass spectrometry Pure and Applied Chemistry. 73: 1579-1588. DOI: 10.1351/Pac200173101579  0.797
2001 McClenathan DM, Ray SJ, Hieftje GM. Novel flow injection strategies for study and control of matrix interferences by inductively coupled plasma time-of-flight mass spectrometry Journal of Analytical Atomic Spectrometry. 16: 987-990. DOI: 10.1039/B104047M  0.813
2001 Ray SJ, Hieftje GM. Mass analyzers for inductively coupled plasma time-of-flight mass spectrometry Journal of Analytical Atomic Spectrometry. 16: 1206-1216. DOI: 10.1039/B102857J  0.643
2001 Ray SJ, Hieftje GM. Microwave plasma torch - Atmospheric-sampling glow discharge modulated tandem source for the sequential acquisition of molecular fragmentation and atomic mass spectra Analytica Chimica Acta. 445: 35-45. DOI: 10.1016/S0003-2670(01)01253-3  0.65
1999 Mahoney PP, Ray SJ, Li G, Hieftje GM. Preliminary investigation of electrothermal vaporization sample introduction for inductively coupled plasma time-of-flight mass spectrometry. Analytical Chemistry. 71: 1378-83. PMID 10204039 DOI: 10.1021/Ac9811625  0.653
1998 Pack BW, Ray SJ, Potyrailo RA, Hiettje GM. Evaluation of Ultrasonic Nebulization for the Analysis of Transient Samples: A Theoretical Model and Practical Considerations Applied Spectroscopy. 52: 1515-1521. DOI: 10.1366/0003702981943211  0.406
1997 Mahoney PP, Guzowski JP, Ray SJ, Hieftje GM. Electrospray Ionization Time-Of-Flight Mass Spectrometer for Elemental Analysis Applied Spectroscopy. 51: 1464-1470. DOI: 10.1366/0003702971939235  0.828
1997 Mahoney PP, Ray SJ, Hieftje GM. Time-of-Flight Mass Spectrometry for Elemental Analysis Applied Spectroscopy. 51: 16A-28A. DOI: 10.1366/0003702971938759  0.594
1997 HIEFTJE GM, MYERS DP, LI G, MAHONEY PP, BURGOYNE TW, RAY SJ, GUZOWSKI JP. Toward the Next Generation of Atomic Mass Spectrometers Journal of Analytical Atomic Spectrometry. 12: 287-292. DOI: 10.1039/A605067K  0.837
1997 Mahoney PP, Ray SJ, Hieftje GM, Li G. Continuum background reduction in orthogonal-acceleration time-of-flight mass spectrometry with continuous ion sources Journal of the American Society For Mass Spectrometry. 8: 125-131. DOI: 10.1016/S1044-0305(96)00199-7  0.588
1997 Mahoney PP, Guzowski JP, Ray SJ, Hieftje GM. Electrospray ionization time-of-flight mass spectrometer for elemental analysis Applied Spectroscopy. 51: 1464-1470.  0.797
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