@article{INTO_2019_169_a5,
     author = {M. S. Maskina and M. I. kuptsov},
     title = {Special cases of hyperbolic parallelograms on the {Lobachevsky} plane},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {39--47},
     publisher = {mathdoc},
     volume = {169},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2019_169_a5/}
}