Mukushev А, Esenova Г, Dosaliev Б, Mukushev С, Adilbekova Б. Modeling the financial pyramid through the Mathcad. bulecon [Internet]. 2023 Jan. 18 [cited 2024 Nov. 21];(3):56-62. Available from: https://bulecon.enu.kz/index.php/main/article/view/101