%0 Journal Article %A V. B. Matveev %A A. O. Smirnov %T Two-phase periodic solutions to the AKNS hierarchy equations %J Zapiski Nauchnykh Seminarov POMI %D 2018 %P 205-227 %V 473 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2018_473_a12/ %G ru %F ZNSL_2018_473_a12