@article {2010,
	title = {On the Euler-Lagrange equation for a variational problem : the general case II},
	journal = {Math. Z. 265 (2010) 889-923},
	number = {SISSA;75/2007/M},
	year = {2010},
	doi = {10.1007/s00209-009-0547-2},
	url = {http://hdl.handle.net/1963/2551},
	author = {Stefano Bianchini and Matteo Gloyer}
}
