Nugrahani, S. D., Y. Y. Nazaruddin, E. Ekawati, and S. Nugroho. “Modelling and Optimization of Primary Steam Reformer System Case Study: The Primary Reformer PT Petrokimia Gresik Indonesia”. Jurnal Otomasi Kontrol Dan Instrumentasi, vol. 1, no. 1, Jan. 2011, p. 1, doi:10.5614/joki.2009.1.1.1.