1. A. Valenza and F. P. La Mantia, Polym. Degrad. Stab., 20 (1988) 63.
2. M. S. Rabello and J. R. White, Polymer, 38 (1997) 6389.
3. A. R. Horrocks and S. Ghosh, Proc. R’95 Int. Cong. on Recovery, Recycling, Re-integration, Geneva, Switzerland, 1–3 February, III. (1995) 31.
4. M. Avella, R. dell’Erba, L. D’Orazio and E. Martuscelli, Polym. Networks Blends, 5 (1995) 47.
5. D. D. Duca and E. P. Moore, in Polypropylene Handbook, E. P. Moore, Jr. (Ed.), Hanser/Gardner Publications Inc., Cincinnati, 1996, p. 237.