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
PIERS 2007 Beijing: Progress In Electromagnetics Research Symposium, Beijing, China. The Electromagnetics Academy, Cambridge, MA: pp. 102-104; ISBN 978-1-934142-00-4
2007,
Wiholm C, Lowden A, Hillert L, Kuster N, Arnetz BB, Akerstedt T, Moffat SD