Geodesic
Spectral properties of solutions of the Tricomi problem for equations of mixed type with two lines of degeneracy, and their applications
Izvestiya. Mathematics , Tome 65 (2001) no. 4, pp. 769-785

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We find the eigenvalues and eigenfunctions for the spectral Tricomi problem for an equation of mixed type with two lines of degeneracy and solve the planar and spatial Tricomi problems for equations with the Lavrent'ev–Bitsadze operator. 
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     author = {K. B. Sabitov and A. A. Karamova},
     title = {Spectral properties of solutions of the {Tricomi} problem for equations of mixed type with two lines of degeneracy, and their applications},
     journal = {Izvestiya. Mathematics },
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2001_65_4_a7/}
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K. B. Sabitov; A. A. Karamova. Spectral properties of solutions of the Tricomi problem for equations of mixed type with two lines of degeneracy, and their applications. Izvestiya. Mathematics , Tome 65 (2001) no. 4, pp. 769-785. http://geodesic.mathdoc.fr/item/IM2_2001_65_4_a7/