%0 Journal Article %A V.Y. Belyaev %T On algebraic closure and amalgamation of semigroups. %J Semigroup forum %D 1982 %P 223-268 %V 25 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1982__25_134576/ %F SF_1982__25_134576