Breno Pinheiro, Ellen Souza, Douglas Vitório, and Hidelberg Albuquerque. 2021. A Comparative Analysis of Machine Learning Named Entity Recognition Tools for the Brazilian and European Portuguese Language Variants. In Anais do XVIII Encontro Nacional de Inteligência Artificial e Computacional, novembro 29, 2021, Evento Online, Brasil. SBC, Porto Alegre, Brasil, 244-255. DOI: https://doi.org/10.5753/eniac.2021.18257.