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2. Untersuchungen über das Morphoklima und die Morphologie des Inselberggebietes von Machakos, Kenia;Ahnert;Catena Supplement,1982
3. Introduction to Geomorphology;Ahnert,1998
4. Exhumed paleoplains of the Precambrian shield of North America;Ambrose;American Journal of Science,1964
5. Interpretation of the basal section of well Kangâmiut-1, offshore southern West Greenland;Bate,1997