@article{KUKZ_1967_4_4_a17,
     author = {Kh. A. Chikhanov},
     title = {The equation of mixed type with an arbitrary line of degeneracy},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {148--152},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1967_4_4_a17/}
}