Аkhmetov Ж.; Azhmukhamedova А. Risks in payment systems. Economic series of the Bulletin of L.N. Gumilyov ENU, [S. l.], n. 3, p. 116–122, 2023. Disponível em: https://bulecon.enu.kz/index.php/main/article/view/327. Acesso em: 21 jan. 2026.