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@article{DE_1999_35_4_a17, author = {I. Tabov and D. Kolev}, title = {Obstacles to the propagation of simple waves in a nonhomogeneous medium}, journal = {Differencialʹnye uravneni\^a}, pages = {570--572}, publisher = {mathdoc}, volume = {35}, number = {4}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1999_35_4_a17/} }
I. Tabov; D. Kolev. Obstacles to the propagation of simple waves in a nonhomogeneous medium. Differencialʹnye uravneniâ, Tome 35 (1999) no. 4, pp. 570-572. http://geodesic.mathdoc.fr/item/DE_1999_35_4_a17/