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@article{DAN_1970_193_3_a5, author = {Z. I. Kozlova}, title = {An $R$-operation with complete depth of chains over systems of sets of power~$\tau$}, journal = {Doklady Akademii Nauk}, pages = {521--524}, publisher = {mathdoc}, volume = {193}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_3_a5/} }
Z. I. Kozlova. An $R$-operation with complete depth of chains over systems of sets of power~$\tau$. Doklady Akademii Nauk, Tome 193 (1970) no. 3, pp. 521-524. http://geodesic.mathdoc.fr/item/DAN_1970_193_3_a5/