1. Bang-Jensen J, Gutin G (2000) Digraphs: theory, algorithms and applications. Springer-Verlag, London, 754 pp
2. Ben-Arieh D, Gutin G, Penn M, Yeo A, Zverovitch A (2003) Transformations of generalized ATSP into ATSP. Oper Res Lett 31:357–365
3. Davis L (1985) Applying adaptive algorithms to epistatic domains. In: Proceeding of the international joint conference on artificial intelligence, pp 162–164
4. Fischetti M, Salazar-González JJ, Toth P (1997) A branch-and-cut algorithm for the symmetric generalized traveling salesman problem. Oper Res 45 (3):378–394
5. Fischetti M, Salazar-González JJ, Toth P (2002) The generalized traveling salesman and orientering problems. In: Gutin G , Punnen A (eds) The traveling salesman problem and its variations. Kluwer, Dordrecht