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2. H. Block and J.P. Kelly, US. Patent 4687589 (1987); UK. Patent 217051B (1986).
3. F.E. Filisko and W.E. Armstrong, US Patent 4744914 (1988).
4. H. Block, J.P. Kelly, A. Qin and T. Watson, Langmuir 6: 6 (1990).
5. HBlock, J.P. Kelly and T. Watson, in: “High Value Polymers,” A.H. Fawcett, ed., RSC Special Pub. No 87, (1991).