1. R. Barron: Cryogenic Systems. New York, McGraw Hill (1966).
2. A. J. Westbrock: Liquefaction of Oxygen, Nitrogen and Hydrogen. In: Applied Cryogenic Engineering (R. D. Vance, W. M. Duke, eds.), pp. 170–191. New York, Wiley (1962).
3. G. G. Haselden: Refrigeration and Liquefaction Cycles. In: Cryogenic Fundamentals (G. G. Haselden, ed.), pp. 17–89. London, Academic Press (1971).
4. R. B. Scott, W. H. Denton, C. M. Nicholls: Technology and Use of Liquid Hydrogen. Oxford, Pergamon Press (1964).
5. R. B. Scott: Cryogenic Engineering. Princeton, N.J., van Nostrand (1959).