@article{DAN_1991_321_3_a8,
     author = {A. A. Novruzov and F. I. Mamedov},
     title = {Smoothness of solutions of second-order degenerate quasilinear},
     journal = {Doklady Akademii Nauk},
     pages = {478--481},
     publisher = {mathdoc},
     volume = {321},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_3_a8/}
}