Villwock G. Small-scale geomorphological mapping of P.D.R. of Yemen: an approach to landscape evaluation. Geog. Fis. Dinam. Quat. [Internet]. 1989 Jan. 1 [cited 2026 May 30];2:93-6. Available from: https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/1141