SamoilenkoV. G. and SamoilenkoY. I., “Asymptotic <i>m</i&gt;-phase soliton-type solutions of a singularly perturbed Korteweg?de Vries equation with variable coefficients. II”, Ukr. Mat. Zhurn., vol. 64, no. 8, pp. 1089-1105, Aug. 2012.