Pardini, G., R. Aringhieri, F. Plana, y F. Gallart. «Soil Properties Relevant to Land Degradation in Abandoned Sloping Fields in Aisa Valley, Central Pyrenees (Spain)». Pirineos 137 (junio 30, 1991): 95–109. Accedido mayo 2, 2024. https://pirineos.revistas.csic.es/index.php/pirineos/article/view/196.