@article{DAN_1967_177_2_a5,
     author = {V. I. Pupko},
     title = {Nonselfintersecting curves on closed surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {272--274},
     year = {1967},
     volume = {177},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_177_2_a5/}
}