1. Contract Number AF 33(657)-10248, Project Number 8169, Task Number 816901, Aeronautical Systems Division, Wright-Patterson Air Force Base.
2. J. C. Mullins et al., “The Thermodynamic Properties of Parahydrogen from 1° to 20°K,” Engineering Experiment Station, Georgia institute of Technology, Atlanta, Ga., (November 1, 1961).
3. NBS Research Paper;HW Woolley,1948
4. H. M. Roder et al., “The Orthobaric Densities of Parahydrogen, Derived Heats of Vaporization and Critical Constants,” Cryogenics, 3, No. 1, 16 (1963).
5. R. S. Hudders et al., in Advances in Cryogenic Engineering, Vol. 8, Plenum Press, New York (1963), p. 461.