@article{ND_2010_6_3_a8,
     author = {A. P. Markeev},
     title = {Nonlinear oscillations of sympathetic pendulums},
     journal = {Russian journal of nonlinear dynamics},
     pages = {605--622},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2010_6_3_a8/}
}