ANWAR; AMIRUDDIN TAWE. Use of the Single Index Model in Determining Investment Decisions During the Covid-19 Pandemic: Study on IDX30 Index Stocks on the IDX in 2020-2021. Economics and Business Journal (ECBIS), [S. l.], v. 1, n. 2, p. 93–102, 2023. DOI: 10.47353/ecbis.v1i2.16. Disponível em: https://ecbis.net/index.php/go/article/view/16. Acesso em: 19 jan. 2026.