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An erratum to this article is available at http://dx.doi.org/10.1057/jors.1974.131.
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Tomlinson, R. OR Is†. J Oper Res Soc 25, 347–360 (1974). https://doi.org/10.1057/jors.1974.70
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DOI: https://doi.org/10.1057/jors.1974.70