Rizki Akbar, F. Fitri, D. Vionanda, and T. O. Mukhti. “Comparison of the Fuzzy Time Series Chen Model and the Heuristic Model in Forecasting the Number of International Tourists in West Sumatra”. Mathematical Journal of Modelling and Forecasting, vol. 2, no. 1, July 2024, pp. 12-19, doi:10.24036/mjmf.v2i1.20.