Mucharam, L., P. Sukarno, S. Siregar, Z. Syihab, E. Soewono, M. Apri, and F. Irzal. “Gas Deliverability Model With Different Vertical Wells Properties”. Journal of Engineering and Technological Sciences, vol. 35, no. 2, Dec. 2013, pp. 125-38, doi:10.5614/itbj.eng.sci.2003.35.2.3.