Géhu, Jean-Marie, and Jeannette Géhu-Franck. 1983. “Vegetatio Litoralis Europaea Notulae Sparsae, I. Foréts et Landes Iittorales de CornouaiIIe Britannique”. Lazaroa 5 (January): 59. https://revistas.ucm.es/index.php/LAZA/article/view/LAZA8383110059A.