References

BKSS90

N. Beckmann, H.P. Kriegel, R. Schneider, and B. Seeger.
The r^*--tree: An efficient and robust access method for points and rectangles.
In Proc. ACM SIGMOD Int. Conf. on Management of Data, pages 322-331, Atlantic City, NJ, June 1990.

GR93

Jim Gray and Andreas Reuter.
Transaction Processing: concepts and techniques.
Morgan Kaufmann, San Mateo, CA, 1993.