Sketch+ for visual and correlation-based exploratory data analysis: a case study with COVID-19 databases - Cazzolato, Mirela Teixeira; Rodrigues, Lucas Santiago; Ribeiro, Marcela Xavier; Gutierrez, Marco Antonio; Traina Junior, Caetano; Traina, Agma Juci Machado (Journal of Information and Data Management - JIDM, 2022)