@article{SM_2003_194_8_a4,
     author = {A. V. Kochergin},
     title = {Non-degenerate fixed points and mixing in flows on a~2-torus},
     journal = {Sbornik. Mathematics},
     pages = {1195--1224},
     publisher = {mathdoc},
     volume = {194},
     number = {8},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_8_a4/}
}