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@article{AL_1992_31_2_a1, author = {Yu. L. Ershov}, title = {Every projective $C_2$-group is realizable}, journal = {Algebra i logika}, pages = {119--131}, publisher = {mathdoc}, volume = {31}, number = {2}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1992_31_2_a1/} }
Yu. L. Ershov. Every projective $C_2$-group is realizable. Algebra i logika, Tome 31 (1992) no. 2, pp. 119-131. http://geodesic.mathdoc.fr/item/AL_1992_31_2_a1/