BURSKII, V. P.; ZHEDANOV, A. S. On Dirichlet problem for string equation, Poncelet problem, Pell-Abel equation, and some other related problems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 4, p. 435–450, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3466. Acesso em: 6 dec. 2025.