Geodesic
The Cauchy problem for symmetrizable systems and for non-strictly hyperbolic equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 6 
V. M. Petkov. The Cauchy problem for symmetrizable systems and for non-strictly hyperbolic equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 6. http://geodesic.mathdoc.fr/item/RM_1971_26_6_a12/
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     title = {The {Cauchy} problem for symmetrizable systems and for non-strictly hyperbolic equations},
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     number = {6},
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     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_6_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] A. P. Calderón, Integrales singulares y sus aplicaciones a ecuaciones diferenciales hiperbolicas, Cursos y Seminarios de Matemática, Fasc. 3, Universidad de Buenos Aires, 1960 | MR

[2] H. Kumanogo, “Remarks on pseudo-differential operators”, J. Math. Soc. Japan, 21:3 (1969)

[3] K. O. Fridrichs, “Pseudo-differential operators”, Lecture notes, Conrant Inst. Math. Sci.; New York Univ., 1968

[4] O. A. Oleinik, “On the Cauchy problem for weakly hyperbolic equations”, Comm. Pure and Appl. Math., 23:4 (1970) | DOI | MR