S. Vorster

Interior Operators in General Categories

S. Vorster, 2000 .

Primitive topological categories

S. Vorster, R. Wille, 1972 .

SEMI-TERMINAL OBJECTS, INDISCRETENESS AND INITIALITY

S. Vorster, 1985 .

H.J.S. Smith and the Fermat Two Squares Theorem

Lance L. Littlejohn, W. N. Everitt, L. Littlejohn, 1999 .