OSPANBAYEV, Z.; BAYGISIEV, M. Uncertainty in the economic theory of J.M. Keynes. Journal of Economic Research & Business Administration, [S. l.], v. 108, n. 2/1, 2016. Disponível em: https://be.kaznu.kz/index.php/math/article/view/957. Acesso em: 3 apr. 2025.