Bala, Nurudeen Muhammad, and Suhailan bin Safei. “A Hybrid Harmony Search and Particle Swarm Optimization Algorithm (HSPSO) for Testing Non-Functional Properties in Software System”. Statistics, Optimization & Information Computing 10, no. 3 (January 9, 2021): 968-982. Accessed April 29, 2024. http://www.iapress.org/index.php/soic/article/view/1039.