Abstract
Two inequalities in Ref. 1 are modified.
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Communicated by G. Leitmann
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Zitron, N.R. A critical condition for the cost density in the circular city model. J Optim Theory Appl 33, 433–434 (1981). https://doi.org/10.1007/BF00935254
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DOI: https://doi.org/10.1007/BF00935254