1. R. Y. Liu, J. M. Parelius, and K. Singh, Multivariate analysis by data depth: Descriptive statistics, graphics and inference (with discussion), Ann. Statist., 1999, 27(3): 783–858.
2. R. Y. Liu and K. Singh, A quality index based on data depth and multivariate rank tests, J. Amer. Statist. Assoc., 1993, 88: 252–260.
3. P. J. Rousseeuw and M. Hubert, Regression depth (with discussion), J. Amer. Statist. Assoc., 1999, 94: 388–433.
4. R. Jörnsten, et al., A robust clustering method and visualization tool based on data depth, statistical data analysis based on the L 1 norm and related methods, Statistics for Industry and Technology, 2002, 27(3): 783–858.
5. R. Jörnsten, Clustering and classification based on the L 1 data depth, JMA, 2004, 90: 67–89.