@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/}
}