Murachman, Bardi, Sarjono Sarjono, Fauzan Afandi, dan Johan Khaeri. 2013. “Optimization Study of the Solid Propellant (Rocket Fuel) Based on Extracted Bitumen of Indonesian Natural Buton Asphalt” 13 (2), 57-72. https://journal.ugm.ac.id/v3/AJChE/article/view/8160.