1. Adam, E.E. Jr (1983), “Towards a typology of production and operations management systems”,Academy of Management Review, Vol. 8 No. 3, July, pp. 365‐75.
2. Anton, J. (1996),Call Center Management by Numbers: Press on Regardless, Santa Maria, CA.
3. Brockmeyer, E. Halstrom, H.A. and Jensen, A. (1948),The Life and Works of A.K. Erlang, Danish Academy of Sciences, Copenhagen.
4. Chase, R.B. (1978), “Where does the customer fit in a service operation?”,Harvard Business Review, Vol. 56 No. 6, November/December, pp. 138‐9.
5. On the validity and utility of queueing models of human service systems