%0 Journal Article %A E. V. Zhuzhoma %A V. S. Medvedev %T On non-orientable two-dimensional basic sets onĀ 3-manifolds %J Sbornik. Mathematics %D 2002 %P 869-888 %V 193 %N 6 %U http://geodesic.mathdoc.fr/item/SM_2002_193_6_a4/ %G en %F SM_2002_193_6_a4