Fried, A., Henry, B. E., Parrish, D. D., Carpenter, J. R., & Buhr, M. P. (1991). Intercomparison of tunable diode laser and gas filter correlation measurements of ambient carbon monoxide. Atmospheric Environment Part A: General Topics, 25, 2277-2284. doi:10.1016/0960-1686(91)90103-E