Wenzel, Thomas P, and Robert Sawyer. Analysis of a State Data on In-Use Emissions from Motor Vehicles (EPA Interagency Agreement DW89938103-01-1): Review of Work Completed. 2000.PDF
Wenzel, Thomas P, Brett C Singer, Etan Gumerman, and Robert Sawyer. Evaluation of the Enhanced Smog Check Program: A Report to the California Inspection and Maintenance Review Committee. 2000.PDF
Wenzel, Thomas P, and Robert Sawyer. Analysis of a Remote Sensing Clean Screen Program in Arizona. 1998.PDF