High earnings through firm influence: the role of hierarchical structures in public procurement.Published in:EPJ Data Science, 2025, v. 14, n. 1, p. 1, doi. 10.1140/epjds/s13688-025-00543-zBy:Sturm, Niclas Frederic;Candia, Cristian;Damásio, Bruno;Pinheiro, Flávio L.Publication type:Article