1. E.R. Stephens, P.L. Hanst, R.C. Doerr, and W.E. Scott, Indus. Engineer. Chem. 48, 1498 (1956).
2. W.E. Scott, E.R. Stephens, P.L. Hanst, and R.C. Doerr, Proc. Am. Pet. Inst. Sect. III 37, 171 (1957).
3. H.B. Singh, Environ. Sci. Technol. 21, 320 (1987).
4. E.R. Stephens, E.F. Darley, O.C. Taylor, and W.E. Scott, Int. J. Air Water Pollut. 4, 79 (1961).
5. P.A. Leighton, The Photochemistry of Air Pollution, Academic Press, New York, 1961.