Marinho da Silva, R. F., Carmona, C. U. and Lagioia, U. C. T. (2011) “Risk Relation and the Corporative Governance Practice in the Brazilian Stock Market: an approach according to the portfolio theory by Markowitz”, Review of Business Management, 13(39), pp. 175–192. doi: 10.7819/rbgn.v13i39.789.