Geodesic
An existence theorem for the solution of an inverse problem for a hyperbolic system of first-order equations
Differencialʹnye uravneniâ, Tome 27 (1991) no. 4, pp. 692-695 
S. P. Belinskii. An existence theorem for the solution of an inverse problem for a hyperbolic system of first-order equations. Differencialʹnye uravneniâ, Tome 27 (1991) no. 4, pp. 692-695. http://geodesic.mathdoc.fr/item/DE_1991_27_4_a15/
@article{DE_1991_27_4_a15,
     author = {S. P. Belinskii},
     title = {An existence theorem for the solution of an inverse problem for a hyperbolic system of first-order equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {692--695},
     year = {1991},
     volume = {27},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_4_a15/}
}
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