@article{DAN_1972_204_5_a6,
     author = {A. A. Novruzov},
     title = {On some problems of the qualitative theory of linear and quasi-linear elliptic equations of second order},
     journal = {Doklady Akademii Nauk},
     pages = {1053--1056},
     publisher = {mathdoc},
     volume = {204},
     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_5_a6/}
}