1. Zhang Y, Chem J, Li H (2007) Polym Bull 59:438
2. Zhu J, Deng J, Liu L, Yang W (2006) Polym Bull 57:841
3. Yao Z, Yin J, Song Y, Jiang G, Song Y (2007) Polym Bull 59:144
4. Lopez DG, Mitre IG, Merino JC, Pastor JM (2007) Polym Bull 59:676
5. Samserzadeh MA, Poursorkhabi V (2009) Polym Degrad Stab 94:1860