Geodesic
On Riemann matrices of the first and second kind
Sbornik. Mathematics, Tome 55 (1986) no. 2, pp. 485-492 
R. K. Romanovskii. On Riemann matrices of the first and second kind. Sbornik. Mathematics, Tome 55 (1986) no. 2, pp. 485-492. http://geodesic.mathdoc.fr/item/SM_1986_55_2_a10/
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     title = {On~Riemann matrices of the first and second kind},
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Voir la notice de l'article provenant de la source Math-Net.Ru

A Riemann representation is obtained for the solutions of the Cauchy problem for a first order hyperbolic system in two independent variables, and applications of this construction to the study of the stability and dichotomy of solutions are indicated. The main results of this paper have been announced earlier (see RZh.Mat., 1983, 4B433). Bibliography: 8 titles.

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[6] Romanovskii R. K., “Ob eksponentsialnoi dikhotomii reshenii uravnenii giperbolicheskogo tipa”, UMN, 31:1 (1976), 259–260 | MR | Zbl

[7] Romanovskii R. K., “Ob eksponentsialnoi dikhotomii reshenii odnogo klassa uravnenii v chastnykh proizvodnykh”, Trudy Vsesoyuznoi konferentsii po uravneniyam v chastnykh proizvodnykh, Izd-vo MGU, M., 1978, 428–429

[8] Romanovskii R. K., “O matritsakh Rimana pervogo i vtorogo roda”, DAN SSSR, 267:3 (1982), 577–580 | MR