The study of the graph of exponential functions from the theory of Raymond Duval. Research, Society and Development, [S. l.], v. 11, n. 11, p. e574111134091, 2022. DOI: 10.33448/rsd-v11i11.34091. Disponível em: https://www.rsdjournal.org/rsd/article/view/34091. Acesso em: 15 dec. 2025.