A. Mohd Rus, “Effect of Titanium Dioxide on Material Properties for Renewable Rapeseed and Sunflower Polyurethane”, IJIE, vol. 1, no. 1, Sep. 2009, Accessed: Apr. 16, 2026. [Online]. Available: https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/72