Y. Sakurai,
M. Yoshikawa,
S. Uemura, and
H. Kojima.
The A-tree: An Index Structure for High-Dimensional Spaces Using Relative Approximation.
In Proc. of the 26th Int. Conf. on Very Large DataBases (VLDB'00),
Cairo (Egypt)
,
pages 516--526,
2000.
(bibtex entry)