SAMOILENKO, V. G.; SAMOILENKO, Y. I. Two-Phase Solitonlike Solutions of the Cauchy Problem for a Singularly Perturbed Korteweg-De-Vries Equation with Variable Coefficients. Ukrains’kyi Matematychnyi Zhurnal, v. 65, n. 11, p. 1515–1530, 25 Nov. 2013.