Shashi Shekhar Chang-Tien Lu Sanjay Chawla Sivakumar Ravada Efficient Join-Index-Based Spatial-Join Processing: A Clustering Approach. 1400-1421 2002 14 IEEE Trans. Knowl. Data Eng. 6 http://www.computer.org/tkde/tk2002/k1400abs.htm db/journals/tkde/tkde14.html#ShekharLCR02