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@article{AL_1986_25_2_a4, author = {N. G. Khisamiev}, title = {Hierarchies of torsion-free abelian groups}, journal = {Algebra i logika}, pages = {205--226}, publisher = {mathdoc}, volume = {25}, number = {2}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1986_25_2_a4/} }
N. G. Khisamiev. Hierarchies of torsion-free abelian groups. Algebra i logika, Tome 25 (1986) no. 2, pp. 205-226. http://geodesic.mathdoc.fr/item/AL_1986_25_2_a4/