@article{VMUMM_1996_2_a13,
     author = {A. Yu. Zaitsev and D. V. Treschev},
     title = {Loss of stability of periodic trajectories in {Hamiltonian} systems depending on parameter by a multiple collision at point $-1$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {69--74},
     publisher = {mathdoc},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1996_2_a13/}
}