@article{ASNSP_1933_2_2_3_297_0,
     author = {Glenn, Oliver E.},
     title = {The mechanics of the stability of a central orbit},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {297--308},
     publisher = {Scuola normale superiore},
     volume = {Ser. 2, 2},
     number = {3},
     year = {1933},
     zbl = {0007.03601},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1933_2_2_3_297_0/}
}