@article{KUKZ_1982_18_18_a2,
     author = {L. K. Astaf'eva},
     title = {On a non-linear {Tricomi} problem},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {21--26},
     year = {1982},
     volume = {18},
     number = {18},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1982_18_18_a2/}
}