Eightieth birthday of Professor Stefan Schwarz. L. Satko; O. Grosek; Boris Schein — 1994 Semigroup forum
Products OF IDEMPOTENT ORDER-PRESERVING TRANSFORMATIONS OF ARBITRARY CHAINS. Boris M. Schein — 1975 Semigroup forum
Semigroups of cosets of semigroups: variations on a Dubreil theme. Boris M. Schein — 1995 Collectanea Mathematica
Completions, translational hulls and ideal extensions of inverse semigroups Boris M. Schein — 1973 Czechoslovak Mathematical Journal
Generalized Groups with the Well-Ordered Set of Idempotents Boris M. Schein — 1964 Matematicko-fyzikálny časopis