Al-waely, Waail Mahmod, and Maad M. Khalil. “Applying Fuzzy Set Method for Solving Mechanical Engineering Problems (Determining Residual Service Life)”. Iraqi Journal for Electrical and Electronic Engineering 6, no. 1 (June 30, 2010): 73–77. Accessed December 8, 2025. https://ijeee.edu.iq/ijeee/article/view/125.