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Adjusting Anomalies in International Tourist Arrivals to North Sumatra During the Peak COVID-19 Period (April 2020 to June 2022) to Enhance the Validity of Time Series Modeling. J. of Research in Math. Trends and Tech. 2025, 7 (2), 72-77. https://doi.org/10.32734/jormtt.v7i2.21718.