V. G. Samoilenko and Y. I. Samoilenko, “Asymptotic $Σ$-solutions to singularly perturbed Benjamin – Bona – Mahony equation with variable coefficients”, Ukr. Mat. Zhurn., vol. 70, no. 2, pp. 236–254, Feb. 2018, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1554