Sulistiowati, D. et al. 2021. Risk Analysis of Gold Sale Price and Investment of Antam Shares Using Expected Shortfall in Pandemic Covid-19. Jurnal Matematika, Statistika dan Komputasi. 17, 3 (May 2021), 428–437. DOI:https://doi.org/10.20956/j.v17i3.12779.