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Niki Pissinou, Kia Makki (Eds.): Proceedings of the Second ACM Workshop on Advances in Geographic Information Systems, ACM Press, ISBN 0-89791-750-2, 1994

Walid G. Aref, Hanan Samet: A Cost Model for Query Optimization Using R-Trees. 0-
Andreas Henrich: A Distance Scan Algorithm for Spatial Access Structures. 136-143