@proceedings {Sarsfield_Cabral,
	title = {Enhancing service quality in public transport systems},
	year = {2006},
	address = {Prague, Czech Republic, July 12-14},
	issn = {1746-4498},
	doi = {10.2495/ut060811},
	url = {http://doi.org/10.2495/ut060811},
	author = {Jos{\'e} Ant{\'o}nio Sarsfield Cabral and G Beir{\~a}o},
	editor = {Ca Brebbia and V. Dolezel}
}
