Detection of fraud in public procurement using data-driven methods: a systematic mapping study Everton Schneider dos Santos, Matheus Machado dos Santos, Márcio Castro and Jônata Tyska Carvalho EPJ Data Sci., 14 1 (2025) 52 Published online: 22 July 2025 DOI: 10.1140/epjds/s13688-025-00569-3