D. P. Andriani, S. Sugiono, L. T. W. N. Kusuma, R. A. Tuhfah, and M. R. Ardiansah, “Optimization of pricing and ordering decisions under duopoly competition for new and remanufactured products in a circular supply chain”, EEJET, vol. 2, no. 3 (134), pp. 47–54, Apr. 2025.