Aji Wibowo Putro, Abdul Wahid. “Well Spacing Effects on Well Productivity in Coalbed Methane Reservoirs”. International Journal of Advanced Science and Technology 29, no. 7s (May 1, 2020): 3245-3252. Accessed September 26, 2021. https://sersc.org/journals/index.php/IJAST/article/view/17605.