NJOKU * , K. An Investment Model for a DC Pension System with Refund Clause under Quadratic Utility. International Journal of Mathematical Analysis and Modelling, [S. l.], v. 7, n. 1, 2024. Disponível em: https://tnsmb.org/journal/index.php/ijmam/article/view/136. Acesso em: 28 jul. 2026.