“Palynomorph Assemblages of the Cuayuca Formation (Paleogene), Puebla, Southern Mexico. Part 1: Trilete Spores, Monolete Spores and Gymnosperm Pollen”. 2013. Ameghiniana 42 (3): 567-78. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/925.