American National Standards Institute (ANSI), Association for the Advancement of Medical Instrumentation (AAMI),
ANSl/AAMI PC69:2007: 1-81, ISBN 978-1-57020-295-7
2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Lyon, France. IEEE: pp. 5684-5687; ISBN 978-1-4244-0787-3