@article {2002,
	title = {An optimal fast-diffusion variational method for non isochronous system},
	number = {SISSA;8/2002/M},
	year = {2002},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/1579},
	author = {Luca Biasco and Massimiliano Berti and Philippe Bolle}
}
@article {2002,
	title = {Optimal stability and instability results for a class of nearly integrable Hamiltonian systems},
	journal = {Atti.Accad.Naz.Lincei Cl.Sci.Fis.Mat.Natur.Rend.Lincei (9) Mat.Appl.13(2002),no.2,77-84},
	number = {SISSA;25/2002/M},
	year = {2002},
	publisher = {SISSA Library},
	url = {http://hdl.handle.net/1963/1596},
	author = {Massimiliano Berti and Luca Biasco and Philippe Bolle}
}
