Қайырбек, Ж., Г. Аузерхан, and Л. Жапсарбаева. “ESTIMATES OF THE EIGENVALUES AND EIGENFUNCTIONS OF OPERATOR ARISING IN SWELLING PRESSURE MODEL”. Bulletin of Abai KazNPU. Series of Physical and Mathematical Sciences, vol. 71, no. 3, Sept. 2020, pp. 59-66, doi:10.51889/2020-3.1728-7901.08.