Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Toegepaste Wiskunde

van Dantzig, D. (1958). Solutions of the equation of Helmholtz in an angle with vanishing directional derivatives along each side : (proceedings KNAW series A, 61(1958), nr 4, Indagationes mathematicae, 20(1958), p 384-398). Stichting Mathematisch Centrum. Toegepaste Wiskunde. Stichting Mathematisch Centrum.