Stichting Mathematisch Centrum
Stichting Mathematisch Centrum. Zuivere Wiskunde

Baayen, P. C., Kuyk, W., & Maurice, M. (1962). On the orbits of the hat-function and on countable maximal commutative semigroups of continuous mappings of the unit interval into itself. Stichting Mathematisch Centrum. Zuivere Wiskunde. Stichting Mathematisch Centrum.