Camargos, Marcos Antônio de, and Julio Alfredo Racchumi Romero. “ Reaction of Sao Paulo Stock Exchange Corporative Events: A Test of the Efficient Market Hypothesis ”. REGE Revista de Gestão 13, no. 3 (September 1, 2006): 57-74. Accessed January 23, 2021. https://www.revistas.usp.br/rege/article/view/36566.