Dasibekov, A., and A. Abzhapbarov. “The Accounting of Inhomogeneity of the Soil Foundations at Arrangement of Sand Bed”. Journal of Mathematics, Mechanics and Computer Science, vol. 77, no. 2, June 2013, pp. 71-78, https://bm.kaznu.kz/index.php/kaznu/article/view/97.