1. Jackson WJ, Khufuss HF (1976) J. Polym Sci. Polym. Chem Ed 14:2043
2. Bohme F, Komber H, Leistner D, Ratzsch M (1994) Macromol Chem. Phys. 195:3
3. Shinn TH, Chen JY, Lin CC (1993) J. Polym Sci. 47:1233
4. Garozzo D, Giuffrida M, Montaudo G, Lenz RW (1987) J. Polym. Sci. Polym. Chem. Ed. 25:271
5. Li XG, Huang MR, Guan GH, Sun T (1998) Polym. Int. 46 : 289