Rozhankovskaya, M.I. and Syavavko, M.S. (1998) “Transformation of formal expansions of solutions of linear differential equations in a parameter into continued RITZ-fractions”, Ukrains’kyi Matematychnyi Zhurnal, 50(5), pp. 679–686. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4906 (Accessed: 7 April 2025).