Huda, H., R. Renanto, T. R. Biyanto, W. Wu, and V. S. K. Adi. “Oil Refinery Heat Exchanger Network Cleaning Scheduling Strategy With Unit Cleanability Consideration”. ASEAN Journal of Chemical Engineering, Vol. 20, no. 1, June 2020, pp. 31-48, https://jurnal.ugm.ac.id/v3/AJChE/article/view/9097.