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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     author = {Ure\~na, Antonio J.},
     title = {Isolated periodic minima are unstable},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {877--889},
     year = {2006},
     publisher = {Elsevier},
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     number = {6},
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     zbl = {05138724},
     language = {en},
     url = {https://www.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

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