1. Mortality from Ship Emissions: A Global Assessment
2. Eidesvik offshore supply vessel Viking Lady. last visited 08.2013, ; 2013.
3. Østensjø platform supply vessel Edda Ferd. last visited 08.2013, ; 2013.
4. Norled battery ferry, to start sailing in 2015. last visited 08.2013, ; 2013.
5. Carolyn dorothy hybrid tugboat online report. last visited 08.2013, ; 2010.