HANIAS, Mike. Non Linear Analysis of S&P Index. Equilibrium. Quarterly Journal of Economics and Economic Policy, [S. l.], v. 8, n. 4, p. 125–135, 2013. DOI: 10.12775/EQUIL.2013.030. Disponível em: https://journals.economic-research.pl/eq/article/view/335. Acesso em: 3 mar. 2024.