@article{DAN_1981_261_2_a0,
     author = {A. B. Bazarbekov and T. Sh. Kal'menov},
     title = {A criterion for strong solvability of the {Tricomi} problem for the {Lavrent{\textquoteright}ev{\textendash}Bitsadze} equation},
     journal = {Doklady Akademii Nauk},
     pages = {265--268},
     year = {1981},
     volume = {261},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_2_a0/}
}