Alqurneh, A., A. Mustapha, and N. Mohd Sharef. “A Partitioning-Based Approach for Clustering COVID-19 Drugs and Co-Medication for Safe Use”. International Journal of Integrated Engineering, vol. 12, no. 5, June 2020, pp. 224-32, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/6334.