@article{GDZPPN001262262,
title = {Free products with amalgamation of semigroups.},
journal = {Semigroup forum},
volume = {46},
year = {1993},
pages = {54-61},
zbl = {0802.20048},
url = {http://dml.mathdoc.fr/item/GDZPPN001262262}
}
Dekov, D.V. Free products with amalgamation of semigroups.. Semigroup forum, Tome 46 (1993) pp. 54-61. http://gdmltest.u-ga.fr/item/GDZPPN001262262/