1. M.S. Bazaraa and C.M. Shetty, Nonlinear Programming. John Wiley and Sons, NY, 1979.
2. J.A. Bondy and U.S.R. Murty, Graph Theory with Applications. Macmillan Press, London, 1976.
3. D. Burton and Ph. L. Toint, On an instance of the inverse shortest paths problem. Math. Programming,53 (1992), 45–61.
4. S. Even, Graph Algorithms. Computer Science Press, Rockville, MD, 1979.
5. R. Gould, Graph Theory. Benjamin/Cummings Publishing Co., Menlo Park, CA, 1988.