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@article{SF_1982__25_134576, author = {V.Y. Belyaev}, title = {On algebraic closure and amalgamation of semigroups.}, journal = {Semigroup forum}, pages = {223--268}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0528.20047}, url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134576/} }
V.Y. Belyaev. On algebraic closure and amalgamation of semigroups.. Semigroup forum, Tome 25 (1982), pp. 223-268. http://geodesic.mathdoc.fr/item/SF_1982__25_134576/