@article{10_1090_S1079_6762_97_00017_6,
     author = {Delshams, Amadeu and Gelfreich, Vassili and Jorba, \~A€ngel and Seara, Tere},
     title = {Lower and upper bounds for the splitting of separatrices of the pendulum under a fast quasiperiodic forcing},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {03},
     year = {1997},
     doi = {10.1090/S1079-6762-97-00017-6},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-97-00017-6/}
}