Yu Che Chang

Affiliations:	1929-1950		Nanjing University, Nanjing Shi, Jiangsu Sheng, China
	1950-1984		Purple Mountain Observatory, Nanjing, Jiangsu, China

(1902 - 1986)
https://www.aip.org/history-programs/niels-bohr-library/oral-histories/4553 The topic was given to me by Professor van Biesbroeck. It was on the orientation of the orbital plane of double stars
https://en.wikipedia.org/wiki/Zhang_Yuzhe
http://cdsads.u-strasbg.fr//full/1928ApJ....68..319C/0000326.html The writer wishes to thank Professor Edwin B. Frost, Professor G. Van Biesbroeck, and Dr. Otto Struve for their suggestions and help during the progress of the work
http://cdsads.u-strasbg.fr//full/1929ApJ....70..182C/0000185.html

George A. Van Biesbroeck	grad student	1929	Chicago
(A Study of the Orientation of the Orbit-Planes of Sixteen Visual Binary Systems Having Determinate Inclinations)