NIELSEN , R. W. Unified Growth Theory contradicted by the absence of takeoffs in the Gross Domestic Product. Journal of Economics and Political Economy, [S. l.], v. 12, n. 2, p. 67–80, 2025. Disponível em: https://journals.econsciences.com/index.php/JEPE/article/view/2565. Acesso em: 27 oct. 2025.