@article{DAN_1980_255_4_a5,
     author = {S. M. Ponomarev},
     title = {On the theory of the {Tricomi} problem for the {Lavrent{\textquoteright}ev-Bicadze} equation with spectral parameter},
     journal = {Doklady Akademii Nauk},
     pages = {797--801},
     publisher = {mathdoc},
     volume = {255},
     number = {4},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_4_a5/}
}