@article{IVM_1987_2_a9,
     author = {S. V. Rychkov},
     title = {Application of axiomatic set theory to the theory of extensions of modules},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {62--69},
     year = {1987},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_2_a9/}
}