@article{ND_2016_12_2_a4,
     author = {A. P. Kuznetsov and S. P. Kuznetsov and Yu. V. Sedova},
     title = {Pendulum system with an infinite number of equilibrium states and quasiperiodic dynamics},
     journal = {Russian journal of nonlinear dynamics},
     pages = {223--234},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2016_12_2_a4/}
}