On commutative principal ideal semigroup rings. F. Decruyenaere; E. Jespers; P. Wauters — 1991 Semigroup forum
Tensor products of spherical and equivariant immersions. Decruyenaere, F.; Dillen, F.; Mihai, I.; Verstraelen, L. — 1994 Bulletin of the Belgian Mathematical Society - Simon Stevin
The semiring of immersions of manifolds. Decruyenaere, F.; Dillen, F.; Verstraelen, L.; Vrancken, L. — 1993 Beiträge zur Algebra und Geometrie