Efficient algorithms for mining outliers from large data sets, Proceedings of the 2000 ACM SIGMOD international conference on Management of data, 2000, DOI:10.1145/342009.335437, ISBN1-58113-217-4.
Fabrizio Angiulli e Clara Pizzuti, Fast Outlier Detection in High Dimensional Spaces, European Conference on Principles of Data Mining and Knowledge Discovery, vol. 2431, 2002, DOI:10.1007/3-540-45681-3_2, ISBN978-3-540-44037-6.