Isolated periodic minima are unstable
Annales de l'I.H.P. Analyse non linéaire, Volume 23 (2006) no. 6, p. 877-889
@article{AIHPC_2006__23_6_877_0,
author = {Ure\~na, Antonio J.},
title = {Isolated periodic minima are unstable},
journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
publisher = {Elsevier},
volume = {23},
number = {6},
year = {2006},
pages = {877-889},
doi = {10.1016/j.anihpc.2005.09.010},
zbl = {05138724},
mrnumber = {2271699},
language = {en},
url = {http://www.numdam.org/item/AIHPC_2006__23_6_877_0}
}

Ureña, Antonio J. Isolated periodic minima are unstable. Annales de l'I.H.P. Analyse non linéaire, Volume 23 (2006) no. 6, pp. 877-889. doi : 10.1016/j.anihpc.2005.09.010. http://www.numdam.org/item/AIHPC_2006__23_6_877_0/

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