1. Designation of North American emission control area to reduce emissions form ships (2010) U.S. Environmental Protection Agency, Ann Arbor. http://www.epa.gov/otaq/regs/nonroad/marine/ci/420f11024.pdf . Accessed 27 Okt 2011
2. Special Areas under MARPOL (2012) International Maritime Organization, London. http://www.imo.org/OurWork/Environment/PollutionPrevention/SpecialAreasUnderMARPOL/Pages/Default.aspx . Accessed 08 Febr 2012
3. Differentiated port and fairway dues (2011) Clean North Sea shipping, Newcastle. http://cleantech.cnss.no/policies-and-instruments/voluntary-instruments/clean-shipping-index/ . Accessed 11 April 2012
4. Skalska K, Miller J, Ledakowicz S (2010) Trends in NOx abatement: a review. Sci Total Environ 408:3976–3989
5. Dinelli G, Civitano L, Rea M (1990) Industrial experiments on pulse corona simultaneous removal of NOx and SO2 from flue gas. IEEE Trans Ind Appl 26:535–541