DOLPHIN: An efficient algorithm for mining distance-based outliers in very large datasets.

Fabrizio Angiulli Fabio Fassetti DOLPHIN: An efficient algorithm for mining distance-based outliers in very large datasets. 2009 3 TKDD 1 http://doi.acm.org/10.1145/1497577.1497581 db/journals/tkdd/tkdd3.html#AngiulliF09