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@article{SF_1986__35_134874, author = {M.M. Lesokhin and A. V. Popyrin}, title = {Bicharacters of semigroups.}, journal = {Semigroup forum}, pages = {253--264}, publisher = {mathdoc}, volume = {35}, year = {1986}, zbl = {0625.20055}, url = {http://geodesic.mathdoc.fr/item/SF_1986__35_134874/} }
M.M. Lesokhin; A. V. Popyrin. Bicharacters of semigroups.. Semigroup forum, Tome 35 (1986), pp. 253-264. http://geodesic.mathdoc.fr/item/SF_1986__35_134874/