@JournalArticle {SIEEUM8156,
	title = {Sustainability: characteristics and scientific roots},
	journal = {Environment, Development and Sustainability},
	volume = {13},
	number = {2},
	year = {2011},
	month = {2011-01-01 00:00:00},
	pages = {257{\textendash}276},
	publisher = {Kluwer Academic Publishers},
	issn = {1387-585X},
	url = {http://sieeum.eng.uminho.pt/publicacoes/pub.aspx?pubid=8156},
	author = {Quental, N. and Louren{\c c}o, J. M. and Silva, F. N.}
}