@article{articlea19197b0,
title   = {Personal charisma or the economy?: macroeconomic indicators of presidential approval ratings in Brazil?},
author = {Ferreira, Alex Luiz and Sakurai, Sérgio Naruhiko},
year = {2013},
doi = {10.1016/j.econ.2013.10.006},
journal   = {Economia}
}