@article{DAN_1991_316_1_a8,
     author = {K. B. Sabitov},
     title = {On the spectrum of a gasdynamic problem of {Frankl'} for equations of mixed type},
     journal = {Doklady Akademii Nauk},
     pages = {40--44},
     publisher = {mathdoc},
     volume = {316},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_1_a8/}
}