1. Assessing capability of a bivariate process with emphasis on hole location;Berg,1989
2. A general multivariate Bayesian process capability index;Bernardo;The Statistician,1996
3. How reliable is your capability index?;Bissell;Appl. Statist.,1990
4. A capability study for an entire product;Bothe,1991
5. Measuring Process Capability;Bothe,1997