@article{1183419493, author = {Griffin, F. L.}, title = {On the apsidal angle in central orbits}, journal = {Bull. Amer. Math. Soc.}, volume = {14}, number = {3}, year = {1907}, pages = { 6-16}, language = {en}, url = {http://dml.mathdoc.fr/item/1183419493} }
Griffin, F. L. On the apsidal angle in central orbits. Bull. Amer. Math. Soc., Tome 14 (1907) no. 3, pp. 6-16. http://gdmltest.u-ga.fr/item/1183419493/