“Determination of Major Cation and Anion Content in Coconut Fiber Ash Potentially Renewable Catalyst: Penentuan Kandungan Kation dan Anion Mayor dalam Abu Serabut Kelapa Berpotensi Katalis Renewable” (2023) JISTECH: Journal of Information Science and Technology, 6(2). Available at: https://www.jistechunipa.com/index.php/istech/article/view/141 (Accessed: 7 May 2026).