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M. Sabatini 1
@article{10_4064_am_26_3_357_362, author = {M. Sabatini}, title = {Quadratic {Isochronous} centers commute}, journal = {Applicationes Mathematicae}, pages = {357--362}, publisher = {mathdoc}, volume = {26}, number = {3}, year = {1999}, doi = {10.4064/am-26-3-357-362}, zbl = {1005.34022}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/am-26-3-357-362/} }
M. Sabatini. Quadratic Isochronous centers commute. Applicationes Mathematicae, Tome 26 (1999) no. 3, pp. 357-362. doi : 10.4064/am-26-3-357-362. http://geodesic.mathdoc.fr/articles/10.4064/am-26-3-357-362/
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