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Fischetti, M., Lodi, A., & Toth, P. (2007). Exact methods for the asymmetric traveling salesman problem. In Gutin, G., & Punnen, A. P. (eds.), The traveling salesman problem and its variations (Vol. 12, pp. 169-205). External link
Lodi, A., & Punnen, A. P. (2007). TSP software. In Gutin, G., & Punnen, A. P. (eds.), The traveling salesman problem and its variations (Vol. 12, pp. 737-749). External link