The idempotents in a periodic Semigroup. - Francis Pastijn (Int. J. Algebra Comput., 1996)

Complete Congruences on Lattices of Varieties and of Pseudovarieties. - Francis Pastijn; Peter G. Trotter (Int. J. Algebra Comput., 1998)

Varieties Generated by Ordered Bands I. - Shamik Ghosh; Francis J. Pastijn; Xianzhong Zhao (Order, 2005)

Varieties Generated by Ordered Bands II. - Francis Pastijn (Order, 2005)