NASA - National Aeronautics and Space Administration

Strawa, A., T. W. Kirchstetter, A. G. Hallar, G. A. Ban-Weiss, J. R. McLaughlin, R. A. Harley, and M. M. Lunden (2010), Optical and physical properties of primary on-road vehicle particle emissions and their implications for climate change, Journal of Aerosol Science, 41, 36-50, doi:10.1016/j.jaerosci.2009.08.010.