@conference {SIEEUM13667,
	title = {Innovative low noise road pavement materials studied in Portugal},
	journal = {Acoustics 2012},
	year = {2012},
	month = {2012-01-01 00:00:00},
	pages = {1{\textendash}6},
	publisher = {Hong Kong Institute of Acoustics},
	address = {Hong Kong China},
	keywords = {Absorption, Cork, Damping, Expanded clay, Low noise pavement, Road surface},
	url = {http://sieeum.eng.uminho.pt/publicacoes/pub.aspx?pubid=13667},
	author = {Freitas, E.F. and Oliveira, J. R. M. and Machado, P. and Pereira, S.}
}