%0 Journal Article %A S. Yu. Dobrokhotov %T Reduction of Hugoniot--Maslov chains for trajectories of solitary vortices of the ``shallow water'' equations to the Hill equation %J Teoretičeskaâ i matematičeskaâ fizika %D 1997 %P 47-66 %V 112 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1997_112_1_a1/ %G ru %F TMF_1997_112_1_a1