@article{CMA_2016_100_a6,
     author = {B. Ya. Lokshin and V. A. Samsonov and M. V. Shamolin},
     title = {Pendulum systems with dynamical symmetry},
     journal = {Contemporary Mathematics and Its Applications},
     pages = {76--133},
     year = {2016},
     volume = {100},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMA_2016_100_a6/}
}