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Silaen, S.A.M., Wigantono, S. and Wasono, W. 2025. Analysis of Nonlinear Discrete Dynamic Systems in the Cournot Duopoly Model With the Influence of Promotion Costs. Sora Journal of Mathematics Education. 6, 2 (Oct. 2025), 54-62. DOI:https://doi.org/10.30598/sora.6.2.54-62.