Fabrizio Angiulli Rachel Ben-Eliyahu-Zohary Luigi Palopoli Outlier detection using default reasoning. 1837-1872 2008 172 Artif. Intell. 16-17 http://dx.doi.org/10.1016/j.artint.2008.07.004 db/journals/ai/ai172.html#AngiulliBP08