1. Aybay, G., O’Connor, M., Vasani, K., and Wu, T. (2001). An introduction to RPR technology. White Paper-Resilient Packet Ring Alliance. Available: http://www.rpralliance.com/articles/ACF16.pdf.
2. Bertsekas, D. and Gallager, R.G. (1992). Data Networks. 2nd Edition. Prentice Hall, Englewood Cliffs, NJ.
3. DIMACS Report;T. Carpenter,1997
4. Cosares, S. and Saniee, I. (1994). An optimization problem related to balancing loads on SONET rings. Telecommunication Systems, 3:165–181.
5. Garey, M.R. and Johnson, D.S. (1979). Computers and Intractability-A Guide to the Theory of NP-Completeness. Freeman, San Francisco.