@inproceedings {4083,
	title = {2nd International Workshop on Diversity in Document Retrieval (DDR 2012)},
	booktitle = {Web Search and Data Mining (WSDM)},
	year = {2012},
	doi = {10.1145/2124295.2124395},
	author = {Craig Macdonald and Jun Wang and Charles Clarke}
}
