@article{1029001156,
author = {Ahmad, Shair},
title = {An existence theorem for periodically perturbed conservative systems.},
journal = {Michigan Math. J.},
volume = {20},
number = {4},
year = {1974},
pages = { 385-392},
language = {en},
url = {http://dml.mathdoc.fr/item/1029001156}
}
Ahmad, Shair. An existence theorem for periodically perturbed conservative systems.. Michigan Math. J., Tome 20 (1974) no. 4, pp. 385-392. http://gdmltest.u-ga.fr/item/1029001156/