CHUIKO , S.; NESMELOVA, O. Periodic boundary-value problem for a Rayleigh-type equation unsolved with respect to the derivative. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 10, p. 1429–1440, 2023. DOI: 10.3842/umzh.v75i10.7362. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7362. Acesso em: 5 dec. 2025.