1. Proc. 2nd Conf. on Industrial Carbon and Graphite;Campbell,1966
2. Proc. 2nd Conf. on Industrial Carbon and Graphite;Cookson,1966
3. J.M. Thomas and C. Roscoe, ibid. ref. [4], p. 249.
4. Proc. 3rd Conf. on Industrial Carbons and Graphite;Marinkovic,1971