Rudolph Ernest Langer has written:
'On the asymptotic solutions of ordinary linear differential
equations about a turning point' -- subject(s): Differential
equations, Linear, Linear Differential equations
'Nonlinear problems' -- subject(s): Nonlinear theories,
Congresses
'A first course in ordinary differential equations' --
subject(s): Differential equations
'Partial differential equations and continuum mechanics' --
subject(s): Congresses, Differential equations, Partial,
Mathematical physics, Mechanics, Partial Differential equations
'Boundary problems in differential equations' -- subject(s):
Boundary value problems, Congresses