Efficient Aggregation of Ranked Inputs. - Nikos Mamoulis; Kit Hung Cheng; Man Lung Yiu; David W. Cheung (ICDE, 2006)

Efficient top-k aggregation of ranked inputs. - Nikos Mamoulis; Man Lung Yiu; Kit Hung Cheng; David W. Cheung (ACM Trans. Database Syst., 2007)