Gustavo Torquette, Victor Nunes, Pedro Paiva, Lourenço Neto, and Ana Lorena. 2022.
 Characterizing instance hardness in classification and regression problems. In <em>Anais do X Symposium on Knowledge Discovery, Mining and Learning</em>, novembro 28, 2022, Campinas/SP, Brasil. SBC, Porto Alegre, Brasil, 178-185. DOI: <a href="https://doi.org/10.5753/kdmile.2022.227758">https://doi.org/10.5753/kdmile.2022.227758</a>.