@article{RLINA_1974_8_56_5_a3,
     author = {Ezeilo, James O. C.},
     title = {Some new criteria for the existence of periodic solutions of a certain second order differential equation},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
     pages = {675--683},
     publisher = {mathdoc},
     volume = {Ser. 8, 56},
     number = {5},
     year = {1974},
     zbl = {0324.34036},
     mrnumber = {0393671},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLINA_1974_8_56_5_a3/}
}