@article{SM_1990_66_1_a1,
     author = {D. V. Anosov},
     title = {On infinite curves on the {Klein} bottle},
     journal = {Sbornik. Mathematics},
     pages = {41--58},
     year = {1990},
     volume = {66},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_66_1_a1/}
}