Patents and geographical space: A spatial analysis of the territory of Piauí. Research, Society and Development, [S. l.], v. 10, n. 9, p. e13310917949, 2021. DOI: 10.33448/rsd-v10i9.17949. Disponível em: https://rsdjournal.org/rsd/article/view/17949. Acesso em: 5 dec. 2025.