Physics in a rural community of São João do Triunfo PR: light reflection classes in Iguaçú river. Research, Society and Development, [S. l.], v. 10, n. 3, p. e8110312866, 2021. DOI: 10.33448/rsd-v10i3.12866. Disponível em: https://rsdjournal.org/rsd/article/view/12866. Acesso em: 5 dec. 2025.