@conference {512,
	title = {UCM at TREC-2012: Does negation influence the retrieval of medical reports?},
	booktitle = {The Twenty-First Text REtrieval Conference},
	year = {2012},
	address = {Gaithersburg, Maryland, Estados Unidos},
	url = {http://trec.nist.gov/pubs/trec21/t21.proceedings-tracks.html},
	author = {D{\'\i}az, Alberto and Miguel Ballesteros and Carrillo de Albornoz, Jorge and Plaza, Laura}
}
