George B. Dantzig, R. Fulkerson, Selmer Martin Johnson|Journal of the Operations Research Society of America|1954
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It is shown that a certain tour of 49 cities, one in each of the 48 states and Washington, D.C., has the shortest road distance. Operations Research, ISSN 0030-364X, was published as Journal of the Operations Research Society of America from 1952 to 1955 under ISSN 0096-3984.