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@article{AL_1973_12_4_a4, author = {Yu. I. Merzlyakov}, title = {Automorphisms of two-dimensional congruence groups}, journal = {Algebra i logika}, pages = {468--477}, publisher = {mathdoc}, volume = {12}, number = {4}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1973_12_4_a4/} }
Yu. I. Merzlyakov. Automorphisms of two-dimensional congruence groups. Algebra i logika, Tome 12 (1973) no. 4, pp. 468-477. http://geodesic.mathdoc.fr/item/AL_1973_12_4_a4/