On the theory of equations of mixed type with two lines of degeneration
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1999), pp. 70-80.

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K. B. Sabitov; A. A. Karamova; G. G. Sharafutdinova. On the theory of equations of mixed type with two lines of degeneration. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1999), pp. 70-80. http://geodesic.mathdoc.fr/item/IVM_1999_11_a7/

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