1. H. C. W. Skinner, M. Ross and C. Frondel, “Asbestos and Other Fibrous Materials” (Oxford University Press, New York, 1988).
2. A. A. Hodgeson (ed.), “Alternatives to Asbestos- the Pros and Cons”, Society of the Chemical Industry Critical Reports on Applied Chemistry, Vol. 26 (Wiley, Chichester, 1989).
3. N. H. Brett, K. J. D. MacKenzie and J. H. Sharp, Q. Rev. Chem. Soc.
24 (1970) 185.
4. K. J. D. MacKenzie and R. H. Meinhold, unpublished results (1992).
5. H. Hoelter, M. Hagenkoetter and K. Robock, German Pat. DE 3914 533 (1990).