Kruglov, V. E. “Solution of a Linear Second-Order Differential Equation With Coefficients Analytic in the Vicinity of a Fuchsian Zero Point”. Ukrains’kyi Matematychnyi Zhurnal 64, no. 10 (October 25, 2012): 1381-1393. Accessed March 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2666.