%0 Journal Article %A S. L. Ziglin %T The integrability by quadratures of variational equations in systems with a~complementary first integral %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2005 %P 802-803 %V 60 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_2005_60_4_a12/ %G en %F RM_2005_60_4_a12