Notes, Comments and Preliminary results Feb 04 2016 Tarcio Da Silva , Carlos Martins-filho and Eduardo Ribeiro   A comparison of nonparametric efficiency estimators: DEA, FDH, DEAC, FDHC, order-m and quantile   Abstract  Contact Information  Citation  Full Text  -  Note   Jan 08 2013 Rosemarie Bröker Bone and Eduardo P Ribeiro   Informational content of corporate ratings in a developing country: the case of Brazilian firms   Abstract  Contact Information  Citation  Full Text  -  Note