@article{INTO_2019_169_a4,
     author = {E. A. Kostina and N. N. Kostina},
     title = {Metric characteristics of hyperbolic polygons and polyhedra},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {31--38},
     publisher = {mathdoc},
     volume = {169},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2019_169_a4/}
}