Муканова, Б. Г., and С. Д. Маусумбекова. “ Solution to a Regularized Inverse Problem for an Elliptic Equation in Cylindrical Coordinates: Analytical Formulas”. Journal of Mathematics, Mechanics and Computer Science, vol. 79, no. 4, Dec. 2013, pp. 92-98, https://bm.kaznu.kz/index.php/kaznu/article/view/118.