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@article{IVM_1963_1_a12, author = {G. N. Makeev}, title = {Focal pairs $T$ and focal stratifiable pairs of congruences}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {98--108}, publisher = {mathdoc}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1963_1_a12/} }
G. N. Makeev. Focal pairs $T$ and focal stratifiable pairs of congruences. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1963), pp. 98-108. http://geodesic.mathdoc.fr/item/IVM_1963_1_a12/