%0 Journal Article %A V. V. Sevostianova %T Invariants of the adjoint action on nil-radicals of parabolic subalgebras in $B_n$, $C_n$, $D_n$ %J Zapiski Nauchnykh Seminarov POMI %D 2011 %P 265-280 %V 386 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2011_386_a7/ %G ru %F ZNSL_2011_386_a7