@article{ND_2012_8_1_a4,
     author = {A. P. Markeev},
     title = {On a periodic motion of a rigid body carrying a material point in the presence of impacts with a horizontal plane},
     journal = {Russian journal of nonlinear dynamics},
     pages = {71--81},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2012_8_1_a4/}
}