Rudolph Ernest Langer

George David Birkhoff	grad student	1922	Harvard
( I. Developments Associated with a Boundary Problem not Linear in the Parameter II. The Boundary Problems and Developments Associated with a System of Linear Differential Equations of the First Order)

Hugh Lonsdale Turrittin	grad student	1933	UW Madison
Henry Scheffé	grad student	1935	UW Madison
Homer Edward Newell	grad student	1940	UW Madison (Astronomy Tree)
George J. Haltiner	grad student	1947	UW Madison (Meteorology Tree)
Ren-yuan Qian	grad student	1944-1947	University of Wisconsin (Madison), University of Delaware (Chemistry Tree)

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Langer RE. (1950) Asymptotic solutions of a differential equation in the theory of microwave propagation Communications On Pure and Applied Mathematics. 3: 427-438
Langer RE. (1937) On the connection formulas and the solutions of the wave equation Physical Review. 51: 669-676