Efficient Approximate Top-k Query Algorithm Using Cube Index. - Dongqu Chen; Guang-Zhong Sun; Neil Zhenqiang Gong (APWeb, 2011)

Efficient Top-K Query Algorithms Using Density Index. - Dongqu Chen; Guang-Zhong Sun; Neil Zhenqiang Gong; Xiaoqiang Zhong (ICAIC (1), 2011)