1. Everything you need to know about NOx
2. Combustion;Glassman,2007
3. Global Digital Central, Thermal Fluidspediahttps://www.thermalfluidscentral.org/encyclopedia/index.php/Basics (Combustion)
4. DieselNet Technology Guide, Gasous Emissionshttps://www.dieselnet.com/tech/emi_gas.php
5. European Commision, Environmenthttp://ec.europa.eu/environment/air/quality/standards.htm