@conference {SIEEUM5278,
	title = {Monitoring historical masonry structures with operational Modal analysis: two case studies},
	journal = {IOMAC 2007 - 2nd International Operational Modal Analysis Conference},
	year = {2007},
	month = {2007-01-01 00:00:00},
	pages = {1{\textendash}8},
	address = {Copenhagen Denmark},
	url = {http://sieeum.eng.uminho.pt/publicacoes/pub.aspx?pubid=5278},
	author = {Ramos, L. F. and Marques, L. and Louren{\c c}o, P. B. and Roeck, G. and Costa, A. C. and Roque, J. A. C.}
}