@article{106930, author = {Jean Mawhin}, title = {Contractive mappings and periodically perturbed conservative systems}, journal = {Archivum Mathematicum}, volume = {012}, year = {1976}, pages = {67-73}, zbl = {0353.47034}, mrnumber = {0437858}, language = {en}, url = {http://dml.mathdoc.fr/item/106930} }
Mawhin, Jean. Contractive mappings and periodically perturbed conservative systems. Archivum Mathematicum, Tome 012 (1976) pp. 67-73. http://gdmltest.u-ga.fr/item/106930/
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