1. C. L. Mantell, ?Carbon and Graphite Handbook? (Wiley Interscience, New York, 1968) Chap. 15.
2. J. M. Hutcheon, in ?Modern Aspects of Graphite Technology?, edited by L. C. F. Blackman (Academic Press, London, 1970) Chap. 2.
3. J. M. Meers, ?Encyclopaedia of Chemical Technology? Vol. 4, 3rd edn. (John Wiley and Sons, New York, 1978) p. 589.
4. I. C. Lewis and L. S. Singer, ?Chemistry and Physics of Carbon?, Vol. 17, edited by P. L. Walker Jr and P. A. Thrower (Marcel Dekker, New York, 1981) p. 1.
5. H. Marsh and P. L. Walker Jr, ?Chemistry and Physics of Carbon? Vol. 15, edited by P. L. Walker Jr and P. A. Thrower (Marcel Dekker, New York, 1979) p. 229.