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7Yutong Gao and M. David Cheekel. Emission Factors Analysis for Multiple Vehicles Using an On-Board, In-Use Emissions Measurement System. SAE Paper. 2007-01-1327.
8Frank Willems,Robert Cloudt, Edwin van den Eijnden,Marcel van Genderen and Ruud Verbeek. Is Closed-Loop SCR Control Required to Meet Future Emission Targets. SAE Paper.2007-01.
