Sur la diffusion des оndes et les lacunes pour les systèmes d'équations hyperbcliques
I. Petrowskyj

This publication is cited in the following articles:

1. A. N. Varchenko, “On normal forms of nonsmoothness of solutions of hyperbolic equations”, Math. USSR-Izv., 30:3 (1988), 615–628        
2. V. A. Vassiliev, “Sharpness and the local Petrovskii condition for strictly hyperbolic operators with constant coefficients”, Math. USSR-Izv., 28:2 (1987), 233–273        
3. M. A. Semenov-Tian-Shansky, “Harmonic analysis on Riemannian symmetric spaces of negative curvature and scattering theory”, Math. USSR-Izv., 10:3 (1976), 535–563