Some remarks on the comparison of the strength of set-theoretic operations
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1970), pp. 34-39.

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     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},
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     url = {http://geodesic.mathdoc.fr/item/IVM_1970_5_a3/}
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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/