%0 Journal Article %A A. Kundu %T Integrable twofold hierarchy of perturbed equations and application to optical soliton dynamics %J Teoretičeskaâ i matematičeskaâ fizika %D 2011 %P 465-478 %V 167 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2011_167_3_a10/ %G ru %F TMF_2011_167_3_a10