SAMOILENKO, V. G.; SAMOILENKO, Y. I. Asymptotic <i>m</i&gt;-phase soliton-type solutions of a singularly perturbed Korteweg?de Vries equation with variable coefficients. Ukrains’kyi Matematychnyi Zhurnal, v. 64, n. 7, p. 970-87, 25 Jul. 2012.