1. A B+-tree structure for large quadtrees;Aref;Computer Vision, Graphics and Image Processing,1984
2. Efficient processing of window queries in the pyramid data;Aref,1990
3. Decomposing a window into maximal quadtree blocks;Aref;ACTA Informatica,1993
4. The R∗-tree: An efficient and robust access method for points and rectangles;Beckmann,1990
5. The space efficiency of quadtrees;Dyer;Computer Graphics and Image Processing,1982