1. Barnett V, Lewis T (1995) Outliers in statistical data. J Oper Res Soc 46:1034
2. Hawkins DM (1980) Identification of outliers. Chapman & Hall. https://doi.org/10.1007/978-94-015-3994-4
3. Hair JF, Black WC, Babin BJ, Anderson RE (2018) Multivariate data analysis, 8th edn
4. Chandola V, Banerjee A, Kumar V (2009) Anomaly detection. Comput Mater Contin 14:1–22
5. Hair JF, Black WC, Babin BJ, Anderson RE (2009) Multivariate data analysis, 7th edn