1. Flanigan, O., Oil and Gas J., 132, (1958).
2. Rhodes, E., Ray, W. H. and Rosehart, R. G., Paper No. 29, presented 19th Canadian Chemical Engineering Conference, October 1969.
3. Scott, D. S. and Rao, R. K., Paper No. 33, presented 19th Canadian Chemical Engineering Conference, October 1969.
4. Kepple, R. R. and Tung, T. V., ANL-6734, Argonne National Laboratory, Argonne, Ill. (1963).