US Environmental Protection Agency
15 Oct 2020 Differences between driver mass settings under GTR 2 and Euro5 (US EPA) EPPR-39-04/Rev.2 2020-10-15 US EPA
23 Apr 2021 Statistical analysis of motorcycle emissions deterioration factor data (CARB and US EPA) EPPR-44-06 2021-04-23 CARB US EPA
15 Dec 2022 Motorcycle Emissions Deterioration Factor Statistical Analysis (CARB and US EPA) EPPR-56-04 2022-12-15 CARB US EPA