%0 Journal Article %A I. A. Tel'nykh %T Topological classification of supertransitive flows on closed nonorientable surfaces. I:~Necessary conditions for topological equivalence %J Matematičeskie zametki %D 2000 %P 461-470 %V 68 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2000_68_3_a15/ %G ru %F MZM_2000_68_3_a15