Часовник (Bulgarian Wikipedia)

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

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about.com

inventors.about.com

bas.bg

ibl.bas.bg

bbc.co.uk

news.bbc.co.uk

belreklama.by

books.google.com

canada.com

doi.org

dx.doi.org

  • Marrison, W. A. Precision determination of frequency // I.R.E. Proc. 16 (2). February 1928. DOI:10.1109/JRPROC.1928.221372. с. 137 – 154.

ethw.org

historyworld.net

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msu.ru

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nist.gov

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richardkunze.de

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wikipedia.org

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