@article {2007,
	title = {On the Euler-Lagrange equation for a variational problem},
	journal = {Discrete Contin. Dynam. Systems A 17 (2007) 449-480},
	number = {SISSA;95/2005/M},
	year = {2007},
	url = {http://hdl.handle.net/1963/1792},
	author = {Stefano Bianchini}
}
