Orumbayeva, N.T., and B.B. Zhantassova. “On a Solution of the Periodic Boundary Value Problem for a Hyperbolic Equation With a Fractional Derivative”. Bulletin of the Karaganda University. Mathematics Series, vol. 121, no. 1, Mar. 2026, pp. 194-01, doi:10.31489/2026m1/194-201.