@article{ARM_1976_12_2_a1,
author = {Mawhin, Jean},
title = {Contractive mappings and periodically perturbed conservative systems},
journal = {Archivum mathematicum},
pages = {67--73},
year = {1976},
volume = {12},
number = {2},
mrnumber = {0437858},
zbl = {0353.47034},
language = {en},
url = {http://geodesic.mathdoc.fr/item/ARM_1976_12_2_a1/}
}
Mawhin, Jean. Contractive mappings and periodically perturbed conservative systems. Archivum mathematicum, Tome 12 (1976) no. 2, pp. 67-73. http://geodesic.mathdoc.fr/item/ARM_1976_12_2_a1/
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