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.