1. Oxides of nitrogen in the earth’s atmosphere: trends, sources, sinks and environmental impacts;Badr;Appl Energy,1993
2. Modeling nitrogen chemistry in combustion;Glarborg;Prog Energy Combust Sci,2018
3. Effiziente Systeme und erneuerbare Energien;der Deutschen Heizungsindustrie (BDH),2017
4. Gas-fired heating boilers - Part 1: General requirements and tests, German version EN15502-1:2012. 2012a.
5. Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW; German version EN 15502-2-1:2012. 2012b.