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://journal.tnsmb.org/index.php/ijmam/article/view/136. Acesso em: 12 sep. 2026.