1. Drewry. Ship operating costs: 2011–2012, annual review and forecast. Drewry Maritime Research, London, UK; 2011.
2. SOLAS. International convention for the safety of life at sea (SOLAS), 1974, as updated in 2009; 2009. (Available at: ).
3. MARPOL. International convention for the prevention of pollution from ships, 1973 as modified by the protocol of 1978; 2010. (Available at: ).
4. DNV. Rules for classification of ships. Det Norske Veritas; 2011. (Available at ).
5. NASA. NASA systems engineering handbook. National Aeronautics and Space Administration, Center for AeroSpace Information; 2007. (Available at: ).