Bulletin of the Brazilian Mathematical Society, New Series
Bulletin of the Brazilian Mathematical Society, New Series > 2009 > 40 > 1 > 85-97
Bulletin of the Brazilian Mathematical Society, New Series > 2016 > 47 > 4 > 1155-1179
Bulletin of the Brazilian Mathematical Society, New Series > 2017 > 48 > 4 > 679-696
Bulletin of the Brazilian Mathematical Society, New Series > 2019 > 50 > 3 > 771-786