1. Dale, J., Tetrahedron., 1993, 49: 8707
2. Goethals, E.J., Adv. Polym. Sci., 1977, 23: 103
3. Penezek, S., Kubissa, P. and Matyjaszewski, K., Adv. Polym. Sci., 1985, 1: 68
4. Heitz, W. and Kress, H.J., Makromol. Chem., Rapid Commun., 1981, 2: 427
5. Muller, H., Hucher, H. and Hoffman, H., 1988, US Pat., 4243799