Eliseu GuimarĂ£es, Daniela Vianna, Aline Paes, and Alexandre Plastino. 2021. Enriching datasets for sentiment analysis in tweets with instance selection. In Anais do IX Symposium on Knowledge Discovery, Mining and Learning, outubro 04, 2021, Rio de Janeiro, Brasil. SBC, Porto Alegre, Brasil, 73-80. DOI: https://doi.org/10.5753/kdmile.2021.17463.