VAN DER HAMMEN, Thomas. Description of some genera and species of fossil pollen and spores. Boletín Geológico, [S. l.], v. 4, n. 2-3, p. 111–117, 1956. DOI: 10.32685/0120-1425/bolgeol4.2-3.1956.261. Disponível em: https://revistas.sgc.gov.co/index.php/boletingeo/article/view/261. Acesso em: 31 ene. 2025.