@article{IM2_1989_33_1_a4,
     author = {L. V. Polterovich},
     title = {Geodesics on the two-dimensional torus with two rotation numbers},
     journal = {Izvestiya. Mathematics },
     pages = {101--114},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_33_1_a4/}
}