Geodesic
On second order hyperbolic equations degenerating in the interior of a region and on its boundary
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 2 
O. A. Oleinik. On second order hyperbolic equations degenerating in the interior of a region and on its boundary. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 2. http://geodesic.mathdoc.fr/item/RM_1969_24_2_a12/
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     title = {On second order hyperbolic equations degenerating in the interior of a~region and on its boundary},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] O. A. Oleinik, “Zadacha Koshi i kraevaya zadacha dlya giperbolicheskikh uravnenii vtorogo poryadka, vyrozhdayuschikhsya v oblasti i na ee granitse”, DAN, 169:3 (1966), 525–528 | MR | Zbl

[2] S. L. Sobolev, Nekotorye primeneniya funktsionalnogo analiza v matematicheskoi fizike, Izd-vo LGU, 1950

[3] A. B. Nersesyan, “O zadache Koshi dlya giperbolicheskogo uravneniya vtorogo poryadka, vyrozhdayuschegosya na nachalnoi giperploskosti”, DAN, 181:4 (1968) | Zbl