@article{MP_1958_a18,
     author = {O. A. Oleinik and A. A. Kirillov},
     title = {XX {\cyrsh}{\cyrk}{\cyro}{\cyrl}{\cyrsftsn}{\cyrn}{\cyra}{\cyrya} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrch}{\cyre}{\cyrs}{\cyrk}{\cyra}{\cyrya} {\cyro}{\cyrl}{\cyri}{\cyrm}{\cyrp}{\cyri}{\cyra}{\cyrd}{\cyra} {{\cyrv}~{\CYRM}{\cyro}{\cyrs}{\cyrk}{\cyrv}{\cyre}}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {221--227},
     publisher = {mathdoc},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_1958_a18/}
}