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2. “A Method of Measuring Smoke Density,” NFPAQuarterly, Vol. 57, No. 3, Jan. 1964, pp. 276–287.
3. Gross, D., Loftus, J. J., and Robertson, A. F., “A Method of Measuring Smoke from Burning Materials,” STP-422, 1967, American Society for Testing and Materials, Philadelphia, Pa.