مراجع[عدل]
^ Elliott، Robert S (May 1999). Electromagnetics: History, Theory, and Applications (باللغة الإنجليزية). صفحة 660. ISBN 978-0-7803-5384-8.
^ Current practice is to use c0 to denote the speed of light in vacuum according to ISO 31. In the original Recommendation of 1983, the symbol c was used for this purpose and continues to be commonly used. See