@article{BGUMI_2021_1_a4,
     author = {N. P. Prochorov and E. N. Dul},
     title = {Graphs of intersections of closed polygonal chains},
     journal = {Journal of the Belarusian State University. Mathematics and Informatics},
     pages = {54--68},
     publisher = {mathdoc},
     volume = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/BGUMI_2021_1_a4/}
}