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
Wiley Series in Microwave and Optical Engineering; Vander Vorst A, Rosen A, Kotsuka Y (eds.): Wiley-IEEE Press, Hoboken, New Jersey; ISBN 978-0-471-73277-8