Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Toegepaste Wiskunde

Koornwinder, T.H. (1973). Orthogonal polynomials in two variables which are eigenfunctions of two independent partial differential operators, 2 : Prepublication. Stichting Mathematisch Centrum. Toegepaste Wiskunde. Stichting Mathematisch Centrum.