@article{GDZPPN00125104X, title = {RESIDUATION IN SEMIGROUPS OF PRE-CLOSURES.}, journal = {Semigroup forum}, volume = {11}, year = {1975}, pages = {328-336}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN00125104X} }
Boyd, C.A. RESIDUATION IN SEMIGROUPS OF PRE-CLOSURES.. Semigroup forum, Tome 11 (1975) pp. 328-336. http://gdmltest.u-ga.fr/item/GDZPPN00125104X/