Spectral properties of a solution to the Gellerstedt problem for mixed-type equations and their applications. Sabitov, K.B.; Kuchkarova, A.N. — 2001 Sibirskij Matematicheskij Zhurnal
On the question of existence of a solution to the Tricomi problem for one class of systems of mixed-type equations. Sabitov, K.B.; Mugafarov, M.F. — 2002 Sibirskij Matematicheskij Zhurnal