1. Faculty of Forestry; University of Toronto; 33 Willcocks Street Toronto ON M5S 3B3 Canada
2. Central Institute of Plastics Engineering & Technology, (CIPET); Guindy Chennai 600 032 India
3. Division of Materials Science; Luleå University of Technology; SE-97187 Luleå Sweden
4. King Abdulaziz University; Jeddah 22254 Saudi Arabia