Aisagaliev, S. A., A. A. Kabidoldanova, and T. M. Sartaev. “To the Solution Construction of Fredholm Integral Equation of the First Kind”. Journal of Mathematics, Mechanics and Computer Science, vol. 65, no. 2, June 2010, pp. 19-28, https://bm.kaznu.kz/index.php/kaznu/article/view/229.