1. M. W. Zemansky, Heat and Thermodynamics, 5th ed.. McGraw-Hill, New York, 1968.
2. NBS Technical Note;RD McCarty,1972
3. HEPAK® is a data base software available through Cryodata.
4. REFPROP® is a data base software available through the National Institute for Standards and Technology.
5. R. F. Barron, Cryogenic Systems, 2nd ed, Oxford Science Press, 1985.