@article{TM_1998_223_a2,
     author = {L. V. Ovsyannikov},
     title = {Group {Classification} of {Gasdynamic} {Submodels}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {21--29},
     publisher = {mathdoc},
     volume = {223},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1998_223_a2/}
}