@article{SM_2002_193_6_a4,
     author = {E. V. Zhuzhoma and V. S. Medvedev},
     title = {On non-orientable two-dimensional basic sets on~3-manifolds},
     journal = {Sbornik. Mathematics},
     pages = {869--888},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_6_a4/}
}