1
by Collatz, Lothar
Published 1951
Springer Berlin Heidelberg

2
by Collatz, Lothar
Published 1964
Springer Berlin Heidelberg

3
by Collatz, Lothar, Wetterling, Wolfgang
Published 1966
Springer Berlin Heidelberg

4
by Collatz, Lothar, Wetterling, Wolfgang
Published 1966
Springer Berlin Heidelberg