1. Nonlinear programming: Analysis and methods;Avriel,1976
2. Barclays, & Barclaycard. (2010). Britain isn’t queuing. Retrieved from http://www.newsroom.barclays.com/content/Detail.aspx?ReleaseID=1791&NewsAreaID=2.
3. Locating capacitated facilities to maximize captured demand;Berman;IIE Transactions,2007
4. Facility location problems with stochastic demands and congestion;Berman,2002
5. The gradual covering decay location problem on a network;Berman;European Journal of Operational Research,2003