%0 Journal Article %A A. I. Neishtadt %T Jumps of the adiabatic invariant on crossing the separatrix, and the origin of the Kirkwood gap $3:1$ %J Doklady Akademii Nauk %D 1987 %P 47-50 %V 295 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1987_295_1_a8/ %G ru %F DAN_1987_295_1_a8