1. S. Dushman, Scientific Foundations of Vacuum Technique, John Wiley and Sons, Inc., New York (1949), p. 130.
2. S. Dushman, Scientific Foundations of Vacuum Technique, John Wiley and Sons, Inc., New York (1949), p. 92.
3. J. Jeans, An Introduction to the Kinetic Theory of Gases, University Press, Cambridge (1959), p. 61.
4. B. M. W. Trapnell, Chemisorption, Butterworths Scientific Publications, London (1955), pp. 49–108, and references cited therein.
5. T. L. Hill, Advances in Catalysis, Vol. 4, Academic Press, New York (1952).