Hanif A, Hanun NR, Febriansah RE. Optimization of Stock Portfolio Using the Markowitz Model in the Era of the COVID-19 Pandemic. TIJAB [Internet]. 2021 Apr. 28 [cited 2024 Nov. 29];5(1):37-50. Available from: https://e-journal.unair.ac.id/TIJAB/article/view/25228