Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Zuivere Wiskunde

Duparc, H. J. A. (1954). Periodicity properties of some recurring sets of integers : (proceedings of the international congress of mathematicians [ICM], amsterdam 1954, vol. 2, p 15-16). In Stichting Mathematisch Centrum. Zuivere Wiskunde (ZW 19/54/R). Stichting Mathematisch Centrum.