@article{DAN_1960_130_2_a8,
     author = {O. S. Ryzhov and G. M. Shefter},
     title = {The approximate structure of one class of nonsteady transsonic flow},
     journal = {Doklady Akademii Nauk},
     pages = {276--279},
     publisher = {mathdoc},
     volume = {130},
     number = {2},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_2_a8/}
}