@article{MS_1981__156_4_a1,
     author = {{\CYRV}.{\CYRG}. {\CYRD}{\cyrm}{\cyri}{\cyrt}{\cyrr}{\cyri}{\cyre}{\cyrv}},
     title = {[unknown]},
     journal = {Matemati\v{c}eskij sbornik},
     pages = {511--522},
     publisher = {mathdoc},
     volume = {156},
     number = {4},
     year = {1981},
     zbl = {0461.53005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MS_1981__156_4_a1/}
}