@article{BBK01,
 author = {Böhm, Christian and Berchtold, Stefan and Keim, Daniel A.},
 journal = {ACM Computing Surveys},
 number = {3},
 pages = {322--373},
 title = {Searching in High--Dimensional Spaces: Index Structures for Improving the Performance of Multimedia Databases},
 volume = {33},
 year = {2001}
}