@article{SJIM_2003_6_1_a14,
     author = {A. I. Rylov},
     title = {Geometric properties of some level lines in plane and axisymmetric gas flows},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {125--137},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2003_6_1_a14/}
}