Perdigão AMM, Rogado NJQ. Soils and Geomorphological development of the Haff Delta of the Vouga River (Portugal). Geog. Fis. Dinam. Quat. 1989;12(1):59-61. Accessed May 25, 2026. https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/828