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Kriegel, Hans-Peter and Horn, H. and Schiwietz, M. (1991): The performance of object decomposition techniques for spatial query processing. 2nd Symposium on large spatial Databases (SSD'91), 1991, Zurich, Switzerland.
Kriegel, Hans-Peter and Schiwietz, M. and Schneider, Ralf and Seeger, B. (1990): Performance comparison of point and spatial access methods. 1st Smposium on the Design and Implementation of Large Spatial Databases, 17-18 Juli 1989, Santa Barabara, CA.