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@article{DAN_1963_151_1_a9, author = {A. S. Pekelis and L. E. Sadovskii}, title = {Projectives of a torsion-free metabelian group}, journal = {Doklady Akademii Nauk}, pages = {42--44}, publisher = {mathdoc}, volume = {151}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a9/} }
A. S. Pekelis; L. E. Sadovskii. Projectives of a torsion-free metabelian group. Doklady Akademii Nauk, Tome 151 (1963) no. 1, pp. 42-44. http://geodesic.mathdoc.fr/item/DAN_1963_151_1_a9/