FAISAL, F. I.; RUMA, Z.; ANWAR; BUDIYANTI, H.; NATSIR, U. D. Optimal Portfolio Formation With Single Index Method: Study on Stocks Listed in the IDX High Dividend 20 Index on the Indonesia Stock Exchange for Period 2019-2022. Economics and Business Journal (ECBIS), [S. l.], v. 1, n. 5, p. 569–578, 2023. DOI: 10.47353/ecbis.v1i5.62. Disponível em: https://ecbis.net/index.php/go/article/view/62. Acesso em: 19 jan. 2026.