1 - 6 papers on partial differential equations |
2 - Almost periodic functions and differential equations |
3 - American mathematical society translations - Series 2 - Volume 1 |
4 - Elements of the theory of functions |
5 - Generalized translation operators and some of their applications |
6 - Introduction to spectral theory : Selfadjoint ordinary differential operators |
7 - Ten papers on differential equations and functional analysis |
8 - Thirteen papers on functions of real and complex variables |