SamoilenkoV. G., & SamoilenkoY. I. (2008). Asymptotic two-phase solitonlike solutions of the singularly perturbed Korteweg-de Vries equation with variable coefficients. Ukrains’kyi Matematychnyi Zhurnal, 60(3), 388–397. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3162