1. Applegate DL, Cook WJ, Bixby RE, Chvátal V (2006) The traveling salesman problem. Princeton University Press, Princeton
2. Ashok B, Patra TK (2010) Locating phase transitions in computationally hard problems. Pramana 75(3):549–563
3. Bollobás B (2001) Random graphs, 2nd edn. Cambridge University Press, Cambridge
4. Cvetković D (2012) Complexity indices for the travelling salesman problem and data mining. Trans Comb 1:35–43
5. Cvetković D, Mitrović-Minić S (1993) A search strategy in branch and bound algorithms for the traveling salesman problem. Krčmar-Nožić, E. (ed) In: Proceedings of SYM-OP-IS XX, Beograd, Yugoslavia, pp 137–140