1. http://199.96.2.32/AHRAArticles/AHRAArticles.dll/Show?ID=278
2. http://www.himss.org/content/files/proceedings/2002/sessions/sesslides/sessl041.pdf
3. http://www.himss.org/content/files/proceedings/2003/Sessions/session93_slides.pdf
4. http://www.iame.com/alumni/docs/Productivity-FullPresentation.pdf
5. http://www.med.siemens.com/medroot/en/news/electro/issues/pdf/heft_1_00_e/02jan-sen.pdf