Rosa, S. N., Tereza, L. ., Agustina, E. ., Desilfa, Y. and Sari, D. . P. P. (2023) “Formation of Optimal Portfolio Using A Single Index in Pharmaceutical Companies ”, Research in Accounting Journal (RAJ) , 4(1), pp. 19–26. doi: 10.37385/raj.v3i1.1892.