1. IMO (International maritime organization). .
2. MARPOL 73/78: Annex VI. Regulations for the prevention of air pollution from ships and NOx technical code.
3. IMO: NOx technical code, Nitrogen oxides (NOx) – Regulation 13.
4. MEPC 65/4/3. Air pollution and energy efficiency. Report of the correspondence group, Japan.
5. MEPC 66/6/6. Consideration and adoption of amendments to mandatory instruments. Comments to the approval at MEPC 65 of amendments to the effective date of the NOx Tier III standards. Canada, Denmark, Germany, Japan and the United States.