James Daniel Colyar

Frey, H. C., Unal, A., Rouphail, N. M., & Colyar, J. D. (2003). On-road measurement of vehicle tailpipe emissions using a portable instrument. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION, 53(8), 992–1002. https://doi.org/10.1080/10473289.2003.10466245