Baigereyev, D., N. Temirbekov, and D. Omariyeva. “Construction of an Iterative Method for Solving a Nonlinear Elliptic Equation Based on a Mixed Finite Element Method”. Journal of Mathematics, Mechanics and Computer Science, vol. 106, no. 2, June 2020, pp. 104-20, doi:10.26577/JMMCS.2020.v106.i2.09.