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Erratum to: Shipping Optimisation Systems (SOS): tramp optimisation perspective
Journal of Shipping and Trade volume 2, Article number: 4 (2017)
Unfortunately, the original PDF version of this article  contained some errors. The equation 8, 11, 13, 14, 15, 16, 17, 19, 22 all displayed incorrectly in the section of Appendix 1. The correct equations can be found below and the original article of PDF version has been updated to reflect this change.
Said El Noshokaty (2017) Shipping Optimisation Systems (SOS): tramp optimisation perspective. J Shipp Trade 2:3. https://doi.org/10.1186/s41072-017-0021-y
The online version of the original article can be found under doi:10.1186/s41072-017-0021-y
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El Noshokaty, S. Erratum to: Shipping Optimisation Systems (SOS): tramp optimisation perspective. J. shipp. trd. 2, 4 (2017). https://doi.org/10.1186/s41072-017-0022-x