1. Geomorphological studies in Norway;Ahlmann;Geogr. Ann.,1919
2. Studies in North-East Greenland 1939–1940;Ahlmann;Geogr. Ann.,1941
3. Introduction to Geomorphology;Ahnert,1998
4. ETOPO1 1 Arc-minute Global Relief Model: Procedures, Data Sources and Analysis;Amante,2009
5. Origin of the highly elevated Pyrenean peneplain;Babault;Tectonics,2005