    @article {IsaacAgudo2005,
	title = {A Graphical Delegation Solution for X.509 Attribute Certificates},
	journal = {ERCIM News},
	number = {63},
	year = {2005},
	month = {October},
	pages = {33-34},
	publisher = {ERCIM},
	issn = {0926-4981},
	author = {Isaac Agudo and Javier Lopez and Jose A. Montenegro}
}
