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Jahiding, M., Usman, I., Ratih Samsusih Rizki, Haryani and Mashuni 2020. 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. 19, 2 (Dec. 2020), 29-35. DOI:https://doi.org/10.22487/gravitasi.v19i2.15359.