@article{AM2_1992__43_1_182448,
     author = {J.-M. Belley and G. Fournier},
     title = {Almost periodic weak solutions to forced pendulum type equations without friction. {(Summary).}},
     journal = {Aequationes mathematicae},
     pages = {313--313},
     year = {1992},
     volume = {43},
     number = {1},
     zbl = {0763.34035},
     url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_182448/}
}