Notes, Comments and Preliminary results Nov 19 2017 Paulo Sergio Ceretta and Alexandre Silva Da costa   The Gap Effect on the Brazilian Exchange   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   Aug 27 2013 Paulo Sergio Ceretta , Alexandre Silva da Costa , Marcelo Brutti Righi and Fernanda Maria Müller   A 10 min tick volatility analysis between the Ibovespa and the S&P500   Abstract  Contact Information  Citation  Full Text  -  Note