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@article{DAN_1977_233_2_a6, author = {G. S. Makanin}, title = {The problem of solvability of equations in a free semigroup}, journal = {Doklady Akademii Nauk}, pages = {287--290}, publisher = {mathdoc}, volume = {233}, number = {2}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_233_2_a6/} }
G. S. Makanin. The problem of solvability of equations in a free semigroup. Doklady Akademii Nauk, Tome 233 (1977) no. 2, pp. 287-290. http://geodesic.mathdoc.fr/item/DAN_1977_233_2_a6/