@article{GDZPPN00125944X, title = {Green's relations, the V relation and congruences on S(X).}, journal = {Semigroup forum}, volume = {37}, year = {1988}, pages = {313-324}, zbl = {0648.20062}, url = {http://dml.mathdoc.fr/item/GDZPPN00125944X} }
Subbiah, S.; Magill, K.D. jr.; Barit, W. Green's relations, the V relation and congruences on S(X).. Semigroup forum, Tome 37 (1988) pp. 313-324. http://gdmltest.u-ga.fr/item/GDZPPN00125944X/