@article{MZM_1983_34_4_a12,
     author = {S. B. Belyi},
     title = {Self-nonintersecting and non intersecting chains},
     journal = {Matemati\v{c}eskie zametki},
     pages = {625--628},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a12/}
}