POLYMER, vol. 40, no. 19, page. 5371 - 5375, 1999-09
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol. 37, no. 7, page. 937 - 957, 1999-04-01
POLYMER DEGRADATION AND STABILITY, vol. 65, no. 1, page. 161 - 163, 1999-01