Multiyaningrum, R., I. F. Amri, M. A. Haris, H. A. Salsabilla, H. N. A. Ginasputri, and S. D. Sintya. “Forecasting the Volatility of Tuna Fish Prices in North Sumatra Using the ARCH Method in the Period January - April 2024”. EIGEN MATHEMATICS JOURNAL, vol. 7, no. 2, Oct. 2024, pp. 93-101, doi:10.29303/emj.v7i2.236.