@article{RM_1960_15_5_a16,
     author = {V. N. Rybakov},
     title = {Quasi-normal families of surfaces on congruences of lines and circles},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_5_a16/}
}