@article{03680245,
title = {Parameters and solutions of linear and nonlinear oscillators.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {2},
year = {1979},
pages = {493-502},
doi = {10.1155/S0161171279000399},
zbl = {0436.34024},
language = {en},
url = {http://dml.mathdoc.fr/item/03680245}
}
Ling, Rina. Parameters and solutions of linear and nonlinear oscillators.. International Journal of Mathematics and Mathematical Sciences, Tome 2 (1979) pp. 493-502. doi : 10.1155/S0161171279000399. http://gdmltest.u-ga.fr/item/03680245/