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@article{DAN_1977_237_2_a4, author = {I. I. Parovichenko}, title = {On the structure of a class of set-theoretic operations}, journal = {Doklady Akademii Nauk}, pages = {272--275}, publisher = {mathdoc}, volume = {237}, number = {2}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_237_2_a4/} }
I. I. Parovichenko. On the structure of a class of set-theoretic operations. Doklady Akademii Nauk, Tome 237 (1977) no. 2, pp. 272-275. http://geodesic.mathdoc.fr/item/DAN_1977_237_2_a4/