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4. United States Environmental Protection Agency: Emission Standards Reference Guide For On-road and Nonroad Vehicles and Engines, http://www.epa.gov/otaq/standards/light-duty/tier2stds.htm.
5. Council of the European Union, European Parliament, Regulation (EC) No 715/2007 of the European Parliament and of the Council of 20 June 2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance), Official Journal of the European Union, 2007, L.171, 1-16, https://eur-lex.europa.eu/legal-content/en/ALL/?uri=CELEX%3A32007R0715.