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@article{AL_1987_26_1_a3, author = {A. A. Fomin}, title = {Invariants and duality in some classes of torsion-free abelian}, journal = {Algebra i logika}, pages = {63--83}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1987_26_1_a3/} }
A. A. Fomin. Invariants and duality in some classes of torsion-free abelian. Algebra i logika, Tome 26 (1987) no. 1, pp. 63-83. http://geodesic.mathdoc.fr/item/AL_1987_26_1_a3/