@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/}
}