1. (2012) DIRECTIVE 97/68/EC of the European Parliament and of the Council of 16 December 1997 on the approximation of the laws of the Member States relating to measures against the emission of gaseous and particulate pollutants from internal combustion engines to be installed in non-road mobile machinery. Version of 6th December 2012
2. European Parliament, European Council (2016) Regulation (EU) 2016/1628 of the European Parliament and of the Council of 14 September 2016 on requirements relating to gaseous and particulate pollutant emission limits and type-approval for internal combustion engines for non-road mobile machinery, amending Regulations (EU) No 1024/2012 and (EU) No 167/2013, and amending and repealing Directive 97/68/EC. Off J Eur Union 59(L 252):53–117. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:L:2016:252:TOC
3. European Commission (2017) Commission delegated regulation (EU) 2017/655 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to monitoring of gaseous pollutant emissions from in-service internal combustion engines installed in non-road mobile machinery. Off J Eur Union 60(L 102):344–363
4. Bonnel P, Perujo A, Provenza A et al. (2013) Non road engines conformity testing based on pems: Lessons learned from the European pilot program. Publications Office
5. Desouza CD, Marsh DJ, Beevers SD et al (2020) Real-world emissions from non-road mobile machinery in London. Atmos Environ 223(8):117301. https://doi.org/10.1016/j.atmosenv.2020.117301