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“Pengaruh Kosentrasi Zeolit Terhadap Kualitas Bio-Oil Yang Diproduksi dari Limbah Sabut Kelapa Muda (Cocos nucifera) Menggunakan Metode Piro-katalitik : (Effect of Zeolite Concentration on the Quality of Bio-fuel Produced from Coconut Fiber (Cocos nucifera) Using the Piro-catalytic Method)”, Gravitasi, vol. 19, no. 2, pp. 29–35, Dec. 2020, doi: 10.22487/gravitasi.v19i2.15359.