1. American Society of Anesthesiologists Committee of Standards and Practice Parameters. Standards for basic anesthetic monitoring 2011 http://www.asahq.org/For-Members/Standards-Guidelines-and-Statements.aspx
2. World Federation of Societies of Anaesthesiologists International standards for a safe practice of anaesthesia 2010 http://www.anaesthesiologists.org/guidelines/practice/2008-international-standards-for-a-safe-practice-of-anaesthesia
3. Global operating theatre distribution and pulse oximetry supply: an estimation from reported data;Funk;Lancet,2010
4. World Health Organization Safe Surgery Saves Lives 2009 http://www.who.int/patientsafety/safesurgery/en/
5. Extending the WHO ‘Safe Surgery Saves Lives’ project through global oximetry;Merry;Anaesthesia,2009