@article{DAN_1958_118_1_a9,
     author = {S. P. Pul'kin},
     title = {The {Tricomi} problem for the general equation of {Lavrentiev--Bitzadze}},
     journal = {Doklady Akademii Nauk},
     pages = {38--41},
     publisher = {mathdoc},
     volume = {118},
     number = {1},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_118_1_a9/}
}