Approximate range searching using binary space partitions. - Mark de Berg; Micha Streppel (Comput. Geom., 2006)

Efficient c-oriented range searching with DOP-trees. - Mark de Berg; Herman J. Haverkort; Micha Streppel (Comput. Geom., 2009)

Approximate Range Searching in External Memory. - Micha Streppel; Ke Yi 001 (Algorithmica, 2011)