TRAGANTALERNGSAK, S.; HIRIOTE, S.; BOONFUEANG, T.; AKAWANNUNG, J. Analysis of clusters among the Retirement Mutual Funds before and during the COVID-19 crisis period. Thai Journal of Operations Research : TJOR, [S. l.], v. 9, n. 2, p. 47–56, 2021. Disponível em: https://ph02.tci-thaijo.org/index.php/TJOR/article/view/243968. Acesso em: 16 sep. 2026.