1. Freitag, D., Grico, U., Muller, P.R., and Nouvertne, W., in Encyclopedia of Polymer Science and Engineering, Mark, H.F., Ed., New York Wiley, 1987, vol. 11, p. 649.
2. Sikdar, S.K., Chem. Tech., 1987, vol. 17, p. 112.
3. Janatpour, M. and Shafer, S.J., Eur. Patent 228672, 1987.
4. Ishii, H., Goyal, M., and Takeuchi, K., J. Mol. Catal. A: Chem., 1999, vol. 144, p. 477.
5. Shaikh, A.G. and Sivaram, S., Chem. Rev., 1996, vol. 96, p. 951.