1. Ries, jun., H. E., and Kimball, W. A., Proc. Second Internat. Cong. Surface Activity, 1, 75 (Butterworths Scientific Pub., London 1957). See also Res and Kimball, J. Phys. Chem., 59, 94 (1955).
2. For the complete pressure-area isotherm, see Ries, jun., H. E., and Cook, H. D., J. Colloid Sci., 9, 535 (1954).