@article{RM_1963_18_5_a1,
     author = {V. I. Arnol'd},
     title = {Proof of a~theorem of {A.\,N.~Kolmogorov} on the invariance of quasi-periodic motions under small perturbations of the {Hamiltonian}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {9--36},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1963},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_5_a1/}
}