Minár, Jozef & Evans, Ian S. 2008 Elementary forms for land surface segmentation: The theoretical basis of terrain analysis and geomorphological mapping. Geomorphology 95 ( 3-4), 236-259. doi:10.1016/j.geomorph.2007.06.003. Available online 27 June 2007; published 15 March 2008.
Evans, I. S. 2006c Allometric development of glacial cirque form: geological, relief and regional effects on the cirques of Wales. Geomorphology 80 (3-4), 245-266.
Evans, I. S. 2007 Glacial landforms, erosional features: major scale forms. In ELIAS, S.A. (Ed.) Encyclopedia of Quaternary Science. Elsevier, Amsterdam, v.1, 838-852. [Evans, D.J.A. (Sub- Ed.) Glacial landforms] [ISBN-10: 0-444-51919-X]