WAN, Yumeng. Comparative Analysis of the Markowitz Model and the Single-Index Model: An Empirical Study on N/T Ratios and Investment Constraints. Journal of Education, Humanities and Social Sciences, [S. l.], v. 61, p. 189–197, 2025. DOI: 10.54097/ggekvx46. Disponível em: https://drpehss.com/index.php/ojs/article/view/31. Acesso em: 2 may. 2026.