A. M. M. Perdigão and N. J. Q. Rogado, “Soils and Geomorphological development of the Haff Delta of the Vouga River (Portugal)”, Geog. Fis. Dinam. Quat., vol. 12, no. 1, pp. 59–61, Jun. 1989, Accessed: May 25, 2026. [Online]. Available: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/828