@article{MS_1989__180_2_a6,
     author = {{\CYRA}.{\CYRL}. {\CYRYA}{\cyrk}{\cyrery}{\cyrm}{\cyri}{\cyrv}},
     title = {{\CYRO} {\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyre} $A$-{\cyrp}{\cyro}{\cyrd}{\cyrs}{\cyrt}{\cyra}{\cyrn}{\cyro}{\cyrv}{\cyro}{\cyrk}},
     journal = {Matemati\v{c}eskij sbornik},
     pages = {294--303},
     publisher = {mathdoc},
     volume = {180},
     number = {2},
     year = {1989},
     zbl = {0738.05003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MS_1989__180_2_a6/}
}