1 - On numerical approximation : Proceedings of a symposium conducted by the mathematics research center United States Army, at the University of Wisconsin, Madison, April 21-23, 1958
Langer, Rudolph Ernest (1894-1968) (Ed.)

Cote : [79 LAN 59]

2 - Orbit theory
Birkhoff, Garrett (1911-1996) (Ed.)   /   Langer, Rudolph Ernest (1894-1968) (Ed.)

Cote : [99 ORB 59]