1982-9949 1982-9949 S1982-99492021000200245 10.17058/rea.v29i2.16417 Brazil Brazil Brazil 00 05 2021 00 05 2021 29 2 245 255 2001 5 8 8 13-28 1965 3 1994 1981 3 1918 2021 2020 2021 2012 2017 1970