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  • Beall, Cynthia M. "Andean, Tibetan and Ethiopian patterns of adaptation to high altitude hypoxia." Journal of Integrative and Comparative Biology. February 2006. http://icb.oxfordjournals.org/cgi/reprint/46/1/18?maxtoshow=&HITS=10 &hits=10&RESULTFORMAT=1&author1=beall&andorexacttitle=and& andorexacttitleabs=and&andorexactfulltext=and&searchid=1&FIRST INDEX=0&sortspec=relevance&fdate=2/1/2005&resourcetype= ­HWCIT
  • Cachel, Susan Ph.D. Physical Anthropologist, Rutgers University. Personal correspondence. December 12, 2007.
  • Easen, Nick. "Man set foot in Ice-Age Tibet." CNN April 18, 2002. http://edition.cnn.com/2002/WORLD/asiapcf/east/04/17/tibet.iceage/
  • Hoit, Brian D. et al. "Nitric oxide and cardiopulmonary hemodynamics in Tibetan highlanders." Journal of Applied Physiology. July 14, 2005. http://jap.physiology.org/cgi/reprint/99/5/1796?maxtoshow=&HITS=10&hits =10&RESULTFORMAT=&fulltext=Nitric+Oxide+and+Cardio-Pulmonary+ Hemodynamics+in+Tibetan+Highlanders.&searchid=1&FIRSTINDEX=0& sortspec=relevance&resourcetype=HWCIT
  • Umer, Mohammed. "Biographical information." University of Addis Ababa. 2005. http://www.pages2005.org/mediaroom/umer.html
  • "Altitude illness." Centers For Disease Control. June 18, 2007. http://wwwn.cdc.gov/travel/yellowBookCh6-AltitudeIllness.aspx