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@article{MAN_1899__51_157929, author = {G.H. Darwin}, title = {Periodic orbits. {With} a plate of figures .}, journal = {Mathematische Annalen}, pages = {523--583}, publisher = {mathdoc}, volume = {51}, year = {1899}, zbl = {29.0803.03}, url = {http://geodesic.mathdoc.fr/item/MAN_1899__51_157929/} }
G.H. Darwin. Periodic orbits. With a plate of figures .. Mathematische Annalen, Tome 51 (1899), pp. 523-583. http://geodesic.mathdoc.fr/item/MAN_1899__51_157929/