@article{AL_1986_25_1_a1, author = {L. P. Lisovik}, title = {Quasirelations in a free group and problems of the equivalence}, journal = {Algebra i logika}, pages = {51--86}, publisher = {mathdoc}, volume = {25}, number = {1}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1986_25_1_a1/} }