Mutagahywa, Dr.M. “Development and Testing of Locally Produced Natural Rubber (Nr) And Pvc Blends”. Tanzania Journal of Engineering and Technology 17, no. 1 (June 30, 1993): 1-11. Accessed December 5, 2024. https://tjet.udsm.ac.tz/index.php/tjet/article/view/142.