@article{DAN_1964_155_1_a41,
     author = {G. D. Karatoprakliev},
     title = {{\CYRP}{\cyro}{\cyrp}{\cyrr}{\cyra}{\cyrv}{\cyrk}{\cyri} {\cyrk}~{\cyrs}{\cyrt}{\cyra}{\cyrt}{\cyrsftsn}{\cyre} {``{\CYRO}{\cyrb}} {\cyro}{\cyrd}{\cyrn}{\cyro}{\cyrm} {\cyro}{\cyrb}{\cyro}{\cyrb}{\cyrshch}{\cyre}{\cyrn}{\cyri}{\cyri} {\cyrz}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} {{\CYRT}} {\cyrd}{\cyrl}{\cyrya} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} $u_{xx}+\operatorname{sign}yu_{yy}=0$''
},
     journal = {Doklady Akademii Nauk},
     pages = {8},
     publisher = {mathdoc},
     volume = {155},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_1_a41/}
}