1. Berry, L.L., Zeithaml, V.A. and Parasuraman, A. (1985), “Quality counts in service, too”,Business Horizons, Vol. 47.
2. Boyles, R.A. (1991), “The Taguchi capability index”,Journal of Quality Technology, Vol. 23, pp. 17‐26.
3. Brocess capability with asymmetric tolerances
4. Chan, L.K., Cheng, S.W. and Spiring, F.A. (1988), “A new measure of process capability: Cpm”,Journal of Quality Technology, Vol. 20, pp. 162‐75.
5. An open-systems approach to video on demand