ANGGRAENI, D.; SUGIYANTO, K. .; ZAM ZAM, M. I. .; PATRIA, H. . PORTFOLIO OPTIMIZATION FOR SHIPPING & DELIVERY SERVICES WITH R: BEFORE AND AFTER PANDEMIC COVID-19. Fair Value: Jurnal Ilmiah Akuntansi dan Keuangan, [S. l.], v. 4, n. 6, p. 550–563, 2022. DOI: 10.32670/fairvalue.v4i6.847. Disponível em: https://journal.ikopin.ac.id/index.php/fairvalue/article/view/847. Acesso em: 22 jul. 2024.