Nurwahidah, N. “QUADRATIC PROGRAMMING: AN OPTIMIZATION TOOL FOR BUILDING GLOBAL MINIMUM VARIANCE PORTFOLIO WITH NO SHORT SALE”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 15, no. 2, June 2021, pp. 305-14, doi:10.30598/barekengvol15iss2pp305-314.