@article{DAN_1961_137_2_a0,
     author = {V. I. Arnol'd},
     title = {The stability of the equilibrium position of a {Hamiltonian} system of ordinary differential equations in the general elliptic case},
     journal = {Doklady Akademii Nauk},
     pages = {255--257},
     publisher = {mathdoc},
     volume = {137},
     number = {2},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_2_a0/}
}