ТОВМА, Н.; АКИМБАЕВА, К. Improvement of quality analysis. Journal of Economic Research & Business Administration, [S. l.], v. 120, n. 2, p. 195–198, 2017. Disponível em: https://be.kaznu.kz/index.php/math/article/view/1894. Acesso em: 24 nov. 2024.