@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/