1. K.A. Gilson, D.K. Khandelwal, Getting more from call centers, McKinsey Quarterly: The Journal of McKinsey and Co, 2005.
2. O.Z. Aksin, M. Armony, V. Mehrotra, The modern call centers: a multi-disciplinary perspective on operations management research, Working paper, Koc University, Istanbul, Turkey, 2007.
3. Designing a call center with impatient customers;Garnett;Manufact. Service Oper. Manag.,2002
4. On the interaction between retrials and sizing of call centers;Aguir;Euro. J. Oper. Res.,2008
5. Queuing models for flexible multi-class call centers with real-time anticipated delays;Jouini;Int. J. Product. Econom.,2009