Imangaliyev, Y.I. “ABOUT DIFFERENCE OF SOLUTION SINGULAR DISTURBED AND UNDISTURBED BOUNDARY PROBLEMS”. Recent Contributions to Physics 2018, no. 3 (November 22, 2018): 122–125. Accessed February 8, 2026. https://bph.kaznu.kz/index.php/zhuzhu/article/view/1028.