@article{SM_1970_12_2_a8,
     author = {A. D. Bruno},
     title = {Instability in {a~Hamiltonian} system and the distribution of asteroids},
     journal = {Sbornik. Mathematics},
     pages = {271--312},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_12_2_a8/}
}