Contraction of some spaces of homeomorphisms Barit, W. — 1972 General Topology and its Relations to Modern Analysis and Algebra
The congruences on S(X) which commute with V. S. Subbiah; K.D. jr. Magill; W. Barit — 1987 Semigroup forum
Green's relations, the V relation and congruences on S(X). S. Subbiah; K.D. jr. Magill; W. Barit — 1988 Semigroup forum