1. Aggarwal, A., Klawe, M. M., Moran, S., Shor, P., Wilber, R.: Geometric applications of a matrix-searching algorithm. Algorithmica2, 195–208 (1987).
2. Burkard, R. E.: Special cases of the travelling salesman problem and heuristics. Acta Math. Appl. Sin.6, 273–288 (1990).
3. Burkard, R. E., Klinz, B., Rudolf, R.: Perspectives of Monge properties in optimization. Discr. Appl. Math.70, 95–161 (1996).
4. Burkard, R. E., Deĭneko, V., van Dal, R., van der Veen, J. A. A., Woeginger, G. J.: Well-solvable cases of the TSP: A survey. SFB-Report No. 52, SFB ‘Optimierung und Kontrolle’, Institute of Mathematics, University of Technology, Graz, Austria, December 1995, submitted for publication.
5. Dijkstra, E. W.: A note on two problems in connection with graphs. Numer. Math.1, 269–271 (1959).