[1]
Orumbayeva, N. and Keldibekova, A. 2019. On the solvability of the duo-periodic problem for the hyperbolic equation system with a mixed derivative. Bulletin of the Karaganda University. Mathematics Series. 93, 1 (Mar. 2019), 59–71. DOI:https://doi.org/10.31489/2019m1/59-71.