http://www.coalspot.com/index.php IMPORTANT
https://www.freightnet.com/freight-quote.php
https://www.steelmint.com/logistics-vesselfreight-coal
teachinf
http://www.tlog.lth.se/fileadmin/tlog/Utbildning/Examensarbete/2009/Exjobb/5672_Blom-Borisson.pdf
