On periodically perturbed conservative systems.
Lazer, A. C. ; Sánchez, D. A.
Michigan Math. J., Tome 16 (1969) no. 1, p. 193-200 / Harvested from Project Euclid
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Publié le : 1969-10-14
Classification:  34.45 
@article{1029000261,
     author = {Lazer, A. C. and S\'anchez, D. A.},
     title = {On periodically perturbed conservative systems.},
     journal = {Michigan Math. J.},
     volume = {16},
     number = {1},
     year = {1969},
     pages = { 193-200},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1029000261}
}

Lazer, A. C.; Sánchez, D. A. On periodically perturbed conservative systems.. Michigan Math. J., Tome 16 (1969) no. 1, pp.  193-200. http://gdmltest.u-ga.fr/item/1029000261/