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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). https://www.jistechunipa.com/index.php/istech/article/view/141