@article{VSGU_2015_10_a7,
     author = {M. V. Shamolin},
     title = {Cases of integrability corresponding to the pendulum motion on the plane},
     journal = {Vestnik Samarskogo universiteta. Estestvennonau\v{c}na\^a seri\^a},
     pages = {91--113},
     publisher = {mathdoc},
     number = {10},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGU_2015_10_a7/}
}