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Shaffer, C. A., H. Samet, and R. C. Nelson, "QUILT: A Geographic Information System Based on Quadtrees", International Journal of Geographic Information Systems, vol. 4, no. 2, pp. 103–131, 1990.
Samet, H., C. A. Shaffer, R. C. Nelson, Y. - G. Huang, K. Fujimura, and A. Rosenfeld, "Hierarchical Data Structures for Geographic Information", Proceedings of the International Colloquium on the Construction and Display of Geoscientific Maps Derived from Databases, Geologisches Jahrbuch A 104, pp. 97–98, December, 1986.