E. . Nooraini, M. A. Prakasa, M. R. . Djalal, R. S. Wibowo, and I. Robandi, “Mixed-Integer Linear Programming for Optimal Operation of Integrated Electricity and Natural Gas System Considering Take or Pay Agreements”, JUTI, vol. 23, no. 2, pp. 32–47, Jul. 2025, doi: 10.12962/j24068535.v23i2.a1265.