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@article{IVM_1970_5_a3, author = {N. V. Ivanova}, title = {Some remarks on the comparison of the strength of set-theoretic operations}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {34--39}, publisher = {mathdoc}, number = {5}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1970_5_a3/} }
N. V. Ivanova. Some remarks on the comparison of the strength of set-theoretic operations. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1970), pp. 34-39. http://geodesic.mathdoc.fr/item/IVM_1970_5_a3/