@article{
 SB11a,
 author = {Skopal, Tom\'{a}\v{s} and Bustos, Benjamin},
 title = {On nonmetric similarity search problems in complex domains},
 journal = {ACM Computing Surveys},
 issue_date = {October 2011},
 volume = {43},
 issue = {4},
 month = {October},
 year = {2011},
 issn = {0360-0300},
 pages = {34:1--34:50},
 articleno = {34},
 numpages = {50},
 url = {http://doi.acm.org/10.1145/1978802.1978813},
 doi = {http://doi.acm.org/10.1145/1978802.1978813},
 acmid = {1978813},
 publisher = {ACM},
 address = {New York, NY, USA},
 keywords = {Similarity retrieval, approximate and exact search, nonmetric distances, similarity measuring},
}