Sucipto, C. S., W. Sulandari, and Y. Susanti. “IMPLEMENTATION OF CROSS-VALIDATION ON HANG SENG INDEX FORECASTING USING HOLT’S EXPONENTIAL SMOOTHING AND AUTO-ARIMA METHOD”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 19, no. 1, Jan. 2025, pp. 13-24, doi:10.30598/barekengvol19iss1pp13-24.