1. T. H. K. Frederking, in: Advances in Cryogenic Engineering, Vol. 8, Plenum Press, New York (1963), p. 489.
2. T. H. K. Frederking, in: Advances in Cryogenic Engineering, Vol. 9, Plenum Press, New York (1964), p. 71.
3. E. L. Park Jr., Ph. D. Dissertation, University of Oklahoma (1965).
4. K. S. Pitzer, J. Chem. Phy.
7:583 (1935).
5. E. A. Guggenheim, J. Chem. Phys.
13:253 (1945).