SAMOILENKO, V. G.; SAMOILENKO, Yu. I. Asymptotic $Σ$-solutions to singularly perturbed Benjamin – Bona – Mahony equation with variable coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 2, p. 236–254, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1554. Acesso em: 5 dec. 2025.