1. Nemhauser, George L. and Laurence A.Wolsey. (1988). Integer and Combinatorial Optimization. John Wiley & Sons, New York.
2. Parrish, Scott H., Djangir A.Babayev, George I.Bell, and Vincil C.Dean. (1996). Mathematical Modeling of Processes and Operations in Telecommunications Network Management. Presented in The 14th Triennial Conference of the International Federation of Operational Research Societies. Vancouver, B.C., Canada. CPLEX, CPLEX Optimization, Inc., 1993.