@article{DAN_1987_295_6_a4,
     author = {A. P. Makhmudov and Z. S. Aliyev},
     title = {On a nonlinear analogue of the implicit method in the theory of},
     journal = {Doklady Akademii Nauk},
     pages = {1306--1309},
     publisher = {mathdoc},
     volume = {295},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_295_6_a4/}
}