Geodesic
The absence of weak lacunae between ovals of the characteristic surface of a hyperbolic operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 6 Cet article a éte moissonné depuis la source Math-Net.Ru

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A. B. Mitel'man. The absence of weak lacunae between ovals of the characteristic surface of a hyperbolic operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 6. http://geodesic.mathdoc.fr/item/RM_1972_27_6_a15/

[1] S. A. Galpern, V. E. Kondratov, “Zadacha Koshi dlya differentsialnogo operatora, raspadayuschegosya na volnovye mnozhiteli”, DAN, 154:4 (1964) | MR

[2] F. Ion, Ploskie volny i sfericheskie srednie v primenenii k differentsialnym uravneniyam s chastnymi proizvodnymi, IL, M., 1958