Nooraini, Ervina, et al. “Mixed-Integer Linear Programming for Optimal Operation of Integrated Electricity and Natural Gas System Considering Take or Pay Agreements”. JUTI: Jurnal Ilmiah Teknologi Informasi, vol. 23, no. 2, July 2025, pp. 32-47, https://doi.org/10.12962/j24068535.v23i2.a1265.