@article{INTO_2019_168_a11,
     author = {V. M. Ulyanov and A. Yu. Kiryanov and V. A. Khripin},
     title = {On the motion of a body suspended on a thread with variable length},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {99--104},
     publisher = {mathdoc},
     volume = {168},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2019_168_a11/}
}