no. 6
Isolated periodic minima are unstable
Annales de l'I.H.P. Analyse non linéaire, Tome 23 (2006) no. 6, pp. 877-889. 
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     title = {Isolated periodic minima are unstable},
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     pages = {877--889},
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     volume = {23},
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     url = {http://archive.numdam.org/articles/10.1016/j.anihpc.2005.09.010/}
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Ureña, Antonio J. Isolated periodic minima are unstable. Annales de l'I.H.P. Analyse non linéaire, Tome 23 (2006) no. 6, pp. 877-889. doi : 10.1016/j.anihpc.2005.09.010. http://archive.numdam.org/articles/10.1016/j.anihpc.2005.09.010/

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