Geodesic
Tricomi problem for an elliptic-hyperbolic equation of the second kind
Eurasian mathematical journal, Tome 5 (2014) no. 3, pp. 80-92.

Voir la notice de l'article provenant de la source Math-Net.Ru

Unique solvability of the Triсomi problem for an elliptic-hyperbolic equation of the second kind is proved with the help of the representation of the generalized solution to a hyperbolic equation with strong degeneration. 
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N. K. Mamadaliev. Tricomi problem for an elliptic-hyperbolic equation of the second kind. Eurasian mathematical journal, Tome 5 (2014) no. 3, pp. 80-92. http://geodesic.mathdoc.fr/item/EMJ_2014_5_3_a4/

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