@article{DAN_1966_168_2_a7,
     author = {G. D. Suvorov and G. A. Kuzik},
     title = {Extended concept of the quasiconformality of a plane mapping and linear systems of differential equations of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {280--283},
     publisher = {mathdoc},
     volume = {168},
     number = {2},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_2_a7/}
}