@article {3500,
	title = {Improving Document Clustering Using Okapi BM25 Feature Weighting},
	journal = {Information Retrieval Journal},
	volume = {14},
	year = {2011},
	pages = {466--487},
	doi = {10.1007/s10791-011-9163-y},
	author = {John S. Whissell and Charles Clarke}
}
