ADAMCHIK , V. S.; LIZAREV , A. D. Wronskians of solutions for one class of differential equations with polynomial coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 6, p. 694–699, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9276. Acesso em: 6 dec. 2025.