@proceedings {4775,
	title = {Optimizing Data Queries Over Heterogeneous Sources},
	journal = {INForum 2013},
	year = {2013},
	address = {{\'E}vora},
	attachments = {https://docentes.fct.unl.pt/sites/default/files/jrcs/files/inforum2013.pdf},
	author = {Grade, Nuno and L{\'u}cio Ferr{\~a}o and Jo{\~a}o Costa Seco}
}
