1. Brown, R. L., and Richards, J. C., Trans. Inst. Chem. Eng., 37, 108 (1959).
2. Brown, R. L., and Richards, J. C., Trans. Inst. Chem. Eng., 38, 243 (1960).
3. Rausch, J. M., Ph.D. thesis, University of Princeton (1949).
4. Deming, W. E., and Mehring, A. L., Indust. Eng. Chem., 21, 661 (1929).