@article{DAN_1960_135_2_a5,
     author = {Yu. I. Neimark and V. N. Gol'dberg},
     title = {Existence theorems for nonlinear mixed problems},
     journal = {Doklady Akademii Nauk},
     pages = {262--265},
     year = {1960},
     volume = {135},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_135_2_a5/}
}