Fallenbach, H., W. Lempp, and K.P Stomer. “Materials Testing and Consultancy for the Tanzanian Industry”. Tanzania Journal of Engineering and Technology 4, no. 2 (December 31, 1979): 65-66. Accessed April 19, 2025. https://tjet.udsm.ac.tz/index.php/tjet/article/view/52.