Честота (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Честота" in Bulgarian language version.

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Davies, A. Handbook of Condition Monitoring: Techniques and Methodology. New York, Springer, 1997. ISBN 9780412613203. с. 275.
Cummings, Karen и др. Understanding physics. New Delhi, John Wiley & Sons Inc., authorized reprint to Wiley – India, Second Reprint: 2007. с. 449, 484, 485, 487.(UP1)
Holzner, Steven. Physics for Dummies. Hoboken, New Jersey, Wiley Publishing Inc, 2006. ISBN 978-0-7645-5433-9. с. 201.