Ats-Tsauri, Muhammad Ibrahim, Bagus Wilarnugroho, and Humiras Hardi Purba. 2022. “A Conceptual Model for Energy Management in the Steel Industry: A Soft System Methodology (SSM) Approach”. SINERGI 26 (3). Jakarta, Indonesia:319-26. https://doi.org/10.22441/sinergi.2022.3.007.