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This comment refers to the invited paper available at doi:10.1007/s11750-017-0456-1.
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Campbell, J.F. Comments on: Continuous approximation models in freight distribution management. TOP 25, 434–437 (2017). https://doi.org/10.1007/s11750-017-0457-0
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DOI: https://doi.org/10.1007/s11750-017-0457-0