@article{GDZPPN001255789,
title = {On algebraic closure and amalgamation of semigroups.},
journal = {Semigroup forum},
volume = {24},
year = {1982},
pages = {223-268},
zbl = {0528.20047},
url = {http://dml.mathdoc.fr/item/GDZPPN001255789}
}
Belyaev, V.Y. On algebraic closure and amalgamation of semigroups.. Semigroup forum, Tome 24 (1982) pp. 223-268. http://gdmltest.u-ga.fr/item/GDZPPN001255789/