@article{DE_1976_12_1_a1,
     author = {S. P. Belinskii},
     title = {A certain inverse problem for linear symmetric $t$-hyperbolicsystems with $n+1$ independent variables},
     journal = {Differencialʹnye uravneni\^a},
     pages = {15--23},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_1_a1/}
}