%0 Journal Article %A A. V. Tsiganov %T Comments on P.\,E.~Ryabov ``Explicit integration and topology of D.\,N.~Goryachev case'' %J Russian journal of nonlinear dynamics %D 2011 %P 715-717 %V 7 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2011_7_3_a19/ %G ru %F ND_2011_7_3_a19