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An improved upper bound for the TSP in cubic 3-edge-connected graphs

David Gamarnik, Moshe Lewenstein and Maxim Sviridenko
Operations Research Letters 33 (5) 467 (2005)
DOI: 10.1016/j.orl.2004.09.005
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On cost matrices with two and three distinct values of Hamiltonian paths and cycles

Santosh N. Kabadi and Abraham P. Punnen
SIAM Journal on Discrete Mathematics 20 (4) 977 (2006)
DOI: 10.1137/S0895480104445332
See this article