@article {MR1683007,
	title = {Variational construction of homoclinics and chaos in presence of a saddle-saddle equilibrium},
	journal = {Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. Rend. Lincei (9) Mat. Appl.},
	volume = {9},
	number = {3},
	year = {1998},
	pages = {167{\textendash}175},
	issn = {1120-6330,1720-0768},
	author = {Massimiliano Berti and Bolle, Philippe}
}
