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@article{IM2_1980_14_3_a1, author = {G. S. Makanin}, title = {Recognition of the rank of equations in a~free semigroup}, journal = {Izvestiya. Mathematics }, pages = {499--545}, publisher = {mathdoc}, volume = {14}, number = {3}, year = {1980}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1980_14_3_a1/} }
G. S. Makanin. Recognition of the rank of equations in a~free semigroup. Izvestiya. Mathematics , Tome 14 (1980) no. 3, pp. 499-545. http://geodesic.mathdoc.fr/item/IM2_1980_14_3_a1/