“Application of Whale Optimization Algorithm Based FOPI Controllers UPQC to Mitigate Harmonics and Voltage Instability in Modern Distribution Power Grids” (2024) iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890, 12(5). Tersedia pada: https://ijournals.in/journal/index.php/ijshre/article/view/270 (Diakses: 21 Oktober 2026).