Tursunov, Dilmurat, Kudayberdi Kozhobekov, and Bekmurza uulu Ybadylla. 2022. “Asymptotics of Solutions of Boundary Value Problems for the Equation εy’’ + xp(x)y’ - q(x)y = F”. Eurasian Mathematical Journal 13 (3):82-91. https://emj.enu.kz/index.php/main/article/view/266.