%0 Journal Article %A K. V. Koshel %A D. V. Stepanov %T Chaotic advection in two layers flow above the isolated bottom obstacle: the role of unsteady-perturbation frequency %J Russian journal of nonlinear dynamics %D 2006 %P 147-164 %V 2 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2006_2_2_a0/ %G ru %F ND_2006_2_2_a0