A non local quantitative characterization of ellipses leading to a solvable differential relation.
Amar, M. ; Berrone, L.R. ; Gianni, R.
JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 9 (2008), / Harvested from The Electronic Library of Mathematics
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Publié le : 2008-01-01
EUDML-ID : urn:eudml:doc:117337 
@article{05548913,
     title = {A non local quantitative characterization of ellipses leading to a solvable differential relation.},
     journal = {JIPAM. Journal of Inequalities in Pure \& Applied Mathematics [electronic only]},
     volume = {9},
     year = {2008},
     zbl = {1180.52006},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05548913}
}

Amar, M.; Berrone, L.R.; Gianni, R. A non local quantitative characterization of ellipses leading to a solvable differential relation.. JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only], Tome 9 (2008) . http://gdmltest.u-ga.fr/item/05548913/