Rozhankovskaya MI, Syavavko MS. Transformation of formal expansions of solutions of linear differential equations in a parameter into continued RITZ-fractions. Ukr. Mat. Zhurn. [Internet]. 1998 May 25 [cited 2025 Apr. 7];50(5):679–686. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4906