Yosmar, Siska, S Damayanti, and S Febrika. “LQ45 Stock Portfolio Selection Using Black-Litterman Model in Pandemic Time Covid-19”. Indonesian Journal of Statistics and Its Applications 5, no. 2 (May 16, 2026): 343–354. Accessed May 22, 2026. https://journal-stats.ipb.ac.id/index.php/ijsa/article/view/823.