A Garch Model Test of The Random Walk Hypothesis: Empirical Evidence from The Platinum Market. Mediterranean Journal of Social Sciences, [S. l.], v. 5, n. 14, p. 77, 2014. Disponível em: https://www.richtmann.org/journal/index.php/mjss/article/view/3132.. Acesso em: 18 jul. 2024.