@article{INTO_2020_179_a2,
     author = {M. D. Kovalev},
     title = {What is a hinge mechanism? {And} what did {Kempe} prove?},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {16--28},
     publisher = {mathdoc},
     volume = {179},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2020_179_a2/}
}