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@article{MMO_1970_21_a5, author = {B. M. Rudyk}, title = {Extensions of modules}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {209--244}, publisher = {mathdoc}, volume = {21}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1970_21_a5/} }
B. M. Rudyk. Extensions of modules. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 21 (1970), pp. 209-244. http://geodesic.mathdoc.fr/item/MMO_1970_21_a5/