Jun 05 2011 Cleiton Taufemback , Ricardo Giglio and Sergio Da Silva   Algorithmic complexity theory detects decreases in the relative efficiency of stock markets in the aftermath of the 2008 financial crisis   Abstract  Contact Information  Citation  Full Text  -  Note   Jan 18 2007 Sergio Da Silva , Annibal Figueiredo , Iram Gleria and Raul Matsushita   Hurst exponents, power laws, and efficiency in the Brazilian foreign exchange market   Abstract  Contact Information  Citation  Full Text  -  Note