@article{LFMO_1929_2_2_a7,
     author = {A. Markoff (jun.)},
     title = {The law of ten thirds and the classification of collisions in the general problem of three bodies},
     journal = {Journal de la Soci\'et\'e Physico-Math\'ematique de L\'eningrade},
     pages = {81--97},
     year = {1929},
     volume = {2},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/LFMO_1929_2_2_a7/}
}