Detection of cartel evidence: a case study for Belém/PA and Santarém/PA using volatility models. Research, Society and Development, [S. l.], v. 10, n. 13, p. e279101321397, 2021. DOI: 10.33448/rsd-v10i13.21397. Disponível em: https://rsdjournal.org/rsd/article/view/21397. Acesso em: 5 dec. 2025.