Mirzakulova, A.E., and N. Atakhan. “Construction of the Solution of the Boundary Value Problem for Integro Differential Equation With a Small Parameter in Highest Derivatives”. Bulletin of the Karaganda University. Mathematics Series, vol. 84, no. 4, Dec. 2016, pp. 99-103, doi:10.31489/2016m4/99-103.