| Collana «Problem Book in the Theory of Functions» di Dover in New York | ||||
| 1 | 1: | Knopp, Konrad Bers, L. ". (tr.) | Problem Book in the Theory of Functions, Volume I. Problems in the Elementary Theory of Functions | 1948 |
| 2 | 2: | Knopp, Konrad Bagemihl, Frederick (tr.) | Problem Book in the Theory of Functions, Volume II. Problems in the Advanced Theory of Functions | 1952 |
