%0 Journal Article %A V. V. Filippov %T Homology properties of the~sets of solutions to ordinary %J Sbornik. Mathematics %D 1997 %P 933-953 %V 188 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1997_188_6_a6/ %G en %F SM_1997_188_6_a6