Pujianti, S., H. Perdana, and N. Satyahadewi. “CONSTRUCTING AN OPTIMAL PORTFOLIO USING CLUSTERING LARGE APPLICATION AND VALUE AT RISK ANALYSIS FOR IDX80 STOCKS”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 20, no. 3, Apr. 2026, pp. 1855-68, doi:10.30598/barekengvol20iss3pp1855-1868.