@article {3663,
	title = {A Survey of Top-k Query Processing Techniques in Relational Database Systems},
	journal = {ACM Computing Surveys},
	volume = {40},
	year = {2008},
	pages = {11:1--11:58},
	doi = {10.1145/1391729.1391730},
	author = {Ihab Ilyas and George Beskales and Mohamed A. Soliman}
}
