@article{ND_2015_11_4_a4,
     author = {A. P. Markeev},
     title = {On stability of permanent rotation of a disk that collides with an horizontal plane},
     journal = {Russian journal of nonlinear dynamics},
     pages = {685--707},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2015_11_4_a4/}
}