Environmentally differentiated port fees – experiences in the Baltic Sea
: Katila J
: Karl-Heinz Breitzmann, Mia Hytti
: 2013
: The Pan-Baltic Manual of Best Practices on Clean Shipping and Port Operations
: 83
: 87
: 978-952-298-004-5
: http://www.hksoa.org/contents/attachments/Presentations/2013/IFSPA2013/Papers/M37.pdf(external)