↑ Frequency Article in the Scientific and Technical Encyclopedic Dictionary.
↑ A new record of atomic clocks accuracy is set (Uncased) . Membrana (February 5, 2010). The appeal date is March 4, 2011. Archived February 9, 2012.
↑ L. Fink. Signals, interference, errors ... Notes about some surprises, paradoxes and delusions in communication theory. - M .: Radio and communication, 1978, 1984.
↑ Angular Frequency (Unsolved) . Big encyclopedic polytechnic dictionary . The appeal date is October 27, 2016.
↑ Devil A. G. Units of physical quantities. - M .: " High School ", 1977. - p. 33. - 287 p.
↑ Dengub V. M. , Smirnov V. G. Units of magnitude. Dictionary reference. - M .: Standards Publishing House, 1990. - P. 104. - 240 p. - ISBN 5-7050-0118-5 .
↑ IEC History (Unc.) . Iec.ch. Circulation date June 2, 2013. Archived June 2, 2013.
↑ Bakshi, KA Electronic Measurement Systems . - US: Technical Publications, 2008. - p. 4–14. - ISBN 978-81-8431-206-5 .
↑ Sometimes abroad between the infrasound and the audible sound take the frequency of 16 Hz.

Fink L. M. Signals, interference, errors…. - M .: Radio and communication, 1984.
Burdun GD, Bazakutsa V. A. Units of physical quantities. - Kharkov: Vishcha school, 1984.
Yavorsky B. M., Detlaf A. A. Physics Handbook. - M .: Science, 1981.

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