@article{IVM_1972_9_a10,
     author = {A. A. Orel},
     title = {The application of variational methods to the solution of boundary value problems for equations of mixed type in transonic gas dynamics},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {76--83},
     publisher = {mathdoc},
     number = {9},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_9_a10/}
}