@article{MS_1956__82_1_a0,
     author = {{\CYRM}.{\CYRSH}. {\CYRF}{\cyrl}{\cyre}{\cyrk}{\cyrs}{\cyre}{\cyrr}},
     title = {{\CYRO} {\cyrs}{\cyrp}{\cyre}{\cyrk}{\cyrt}{\cyrr}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrishrt} {\cyrf}{\cyru}{\cyrn}{\cyrk}{\cyrc}{\cyri}{\cyri} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrt}{\cyro}{\cyrr}{\cyra} $- \sum ^3_{i,k=1} {\partial {\o}ver \partial x_i} \ensuremath{\leq}ft[ a_{ik} (x_1, x_2, x_3) {\partial u {\o}ver \partial x_k}  + c(x_1, x_2, x_3) u$},
     journal = {Matemati\v{c}eskij sbornik},
     pages = {3--22},
     publisher = {mathdoc},
     volume = {82},
     number = {1},
     year = {1956},
     zbl = {0071.31803},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MS_1956__82_1_a0/}
}