Geodesic
Solvability of Some Inverse Problems of Determining Coefficients of Mixed-Type Equations
Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 8 (2008) no. 3, pp. 81-99
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Considering the mixed-type equations also referred to as pseudohyperbolic equations, we study the solvability of some problems of finding a solution together with an unknown time-dependent coefficient. We prove the existence of regular solutions for these equations. 
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A. I. Kozhanov. Solvability of Some Inverse Problems of Determining Coefficients of Mixed-Type Equations. Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 8 (2008) no. 3, pp. 81-99. http://geodesic.mathdoc.fr/item/VNGU_2008_8_3_a4/

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