Geodesic
Quasi-normal families of surfaces on congruences of lines and circles
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 5 
V. N. Rybakov. Quasi-normal families of surfaces on congruences of lines and circles. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 5. http://geodesic.mathdoc.fr/item/RM_1960_15_5_a16/
@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},
     year = {1960},
     volume = {15},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_5_a16/}
}
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