@article{RM_1963_18_6_a1,
     author = {V. I. Arnol'd},
     title = {Small denominators and problems of stability of motion in classical and celestial mechanics},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {85--191},
     publisher = {mathdoc},
     volume = {18},
     number = {6},
     year = {1963},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_6_a1/}
}