@article{IVM_1972_11_a7,
     author = {A. A. Orel},
     title = {On the theory of direct problems of transonic gas flows},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {53--62},
     year = {1972},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_11_a7/}
}