@article{MZM_2000_68_3_a15,
     author = {I. A. Tel'nykh},
     title = {Topological classification of supertransitive flows on closed nonorientable surfaces. {I:~Necessary} conditions for topological equivalence},
     journal = {Matemati\v{c}eskie zametki},
     pages = {461--470},
     publisher = {mathdoc},
     volume = {68},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2000_68_3_a15/}
}