@article{KUTGS_1979_11_a14,
     author = {V. V. Shurygin},
     title = {Generalization of a theorem},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {120--124},
     publisher = {mathdoc},
     volume = {11},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1979_11_a14/}
}