POLYMER, vol. 39, no. 14, page. 3073 - 3081, 1998-06
POLYMER, vol. 38, no. 20, page. 5161 - 5167, 1997-09
POLYMER, vol. 38, no. 8, page. 1835 - 1843, 1997-04
POLYMER, vol. 34, no. 23, page. 4832 - 4836, 1993-01