@article{DAN_1965_163_2_a8,
     author = {A. B. Shabat},
     title = {On a property of solutions of elliptic equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {303--305},
     publisher = {mathdoc},
     volume = {163},
     number = {2},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_163_2_a8/}
}