@article{GDZPPN002039613,
title = {Almost periodic weak solutions to forced pendulum type equations without friction.},
journal = {Aequationes mathematicae},
volume = {44},
year = {1992},
pages = {100-108},
zbl = {0763.34035},
url = {http://dml.mathdoc.fr/item/GDZPPN002039613}
}
Belley, J.-M.; Fournier, G. Almost periodic weak solutions to forced pendulum type equations without friction.. Aequationes mathematicae, Tome 44 (1992) pp. 100-108. http://gdmltest.u-ga.fr/item/GDZPPN002039613/