A. Rahim, Sharafiz, et al. “Data Clustering Based on Gaussian Mixture Model and Expectation- Maximization Algorithm for Data-Driven Structural Health Monitoring System ”. International Journal of Integrated Engineering, vol. 13, no. 7, Sept. 2021, pp. 167-75, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/9540.