Geodesic
On hyperbolic systems of equations with zero generalized Laplace invariants
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 13 (2007) no. 4, pp. 74-83 
A. V. Zhiber; Yu. G. Mikhailova. On hyperbolic systems of equations with zero generalized Laplace invariants. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 13 (2007) no. 4, pp. 74-83. http://geodesic.mathdoc.fr/item/TIMM_2007_13_4_a6/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

A criterion for the interruption of the sequence of generalized Laplace invariants is found. A general solution of a system of linear hyperbolic equations with zero invariants is constructed.

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