1-3 of 3 Books
Problems and theorems in analysis
By George Pólya,Gábor Szegő,C.E. Billigheimer,Dorothee Aeppli,James Allister Jenkins
Potential theory, Copenhagen 1979
By Berg, Christian,Gunnar Forst,Bent Fuglede
The cos [pi lambda] theorem
By Matts R. Essén