Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Numerieke Wiskunde
Unknown CWI/SMC

Kok, J. (1980). An algol 68 routine for the approximation of partial derivatives on a two-dimensional grid. In Stichting Mathematisch Centrum. Numerieke Wiskunde (94/80). Stichting Mathematisch Centrum.