1. Andersson, J., Giechaskiel, B., Muñoz-Bueno, R., Sandbach, E., & Dilara, P. (2007). Particle Measurement Programme (PMP), Light-duty Inter-laboratory Correlation Exercise (ILCE_LD). Final Report, Institute for Environment and Sustainability, EUR 22775 EN.
2. Ayala, A., Herner, J. D., Zhang, S., Robertson, W., Frodin, B., Huai, T., et al. (2007). Experiences from the CARB PMP-based Program. In International conference on transport and environment: A global challenge, technical and policy solutions, Milan, Italy, March 19–21.
3. Ayala, A., Zhang, S., Collins, J., Zhan, T., Dwyer, H., Huai, T., et al. (2008). California's informal participation in the Particle Measurement Programme (PMP) Light Duty Inter-Laboratory Correlation Exercise (ILCE_LD). CARB final research report, October.
4. Barone, T., Storey, J., & Domingo, N. (2009). Robust diesel particulate filter from School Bus Retrofit Program, Southeast Diesel Collaborative. In 4th annual partners meeting, June 16.
5. On-road and laboratory investigation of low-level PM emissions of a modern diesel particulate filter equipped diesel passenger car;Bergmann;Atmospheric Environment,2009