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3. Maegdefrau, H. (1989)Effects and consequences to the human body upon falling on a rope. Doctorate dissertation. Ludwig-Maximilians-University Munich, translated from German by David LiaBraaten.
4. Pavier, M. (1998) Experimental and theoretical simulations of climbing falls.Sports Engineering,1, 79–91.
5. UIAA (2004) Mountaineering and Climbing Equipment: Connectors, UIAA 121, http://www.uiaa.ch/web.test/visual/Safety/ UIAA121Connectors01-2004.pdf, January 20, 2005.