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Birx, Alexander; Disser, Yann; Hopp, Alexander V.; Karousatou, Christina (May 2021). "An improved lower bound for competitive graph exploration". Theoretical Computer Science. 868: 65–86. arXiv:2002.10958. doi:10.1016/j.tcs.2021.04.003. S2CID211296296.
Rosenkrantz, Daniel J.; Stearns, Richard E.; Lewis, II, Philip M. (1977). "An Analysis of Several Heuristics for the Traveling Salesman Problem". SIAM Journal on Computing. 6 (3): 563–581. doi:10.1137/0206041. S2CID14764079.
Birx, Alexander; Disser, Yann; Hopp, Alexander V.; Karousatou, Christina (May 2021). "An improved lower bound for competitive graph exploration". Theoretical Computer Science. 868: 65–86. arXiv:2002.10958. doi:10.1016/j.tcs.2021.04.003. S2CID211296296.