Andrade, João, et al. “Morphology, Biostratigraphy, and Evolution of PliocenePleistocene Diatoms Proboscia Barboi and Proboscia Curvirostris”. Geologica Acta, vol. 17, Dec. 2019, pp. 1-17, https://raco.cat/index.php/GeologicaActa/article/view/361041.