Anggraeni D, Sugiyanto K, Zam Zam MI, Patria H. PORTFOLIO OPTIMIZATION FOR SHIPPING & DELIVERY SERVICES WITH R: BEFORE AND AFTER PANDEMIC COVID-19. JA [Internet]. 2022Jan.28 [cited 2024Jul.22];4(6):550-63. Available from: https://journal.ikopin.ac.id/index.php/fairvalue/article/view/847