@article {DBLP:journals/pvldb/QinYC12,
	title = {{D}iversifying {T}op-{K} {R}esults},
	journal = {PVLDB},
	volume = {5},
	number = {11},
	year = {2012},
	pages = {1124-1135},
	author = {Lu Qin and Jeffrey Xu Yu and Lijun Chang}
}
