A representation of a semigroup by a semigroup of matrices over a group with zero. F. Pastijn — 1975 Semigroup forum
Review of the Proceedings of the International Symposium on the Semigroup Theory and ist Related Fields - M. Yamanda and H. Tominaga, eds. F. Pastijn — 1992 Semigroup forum
Subsemigroups of completely simple semigroups II. F. Pastijn; A. Antonippillai — 1993 Semigroup forum
Subgroups of free idempotent generated regular semigroups. F. Pastijn; K.S.S. Nambooripad — 1980 Semigroup forum