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* [http://www.cmi.cz/index.php?act=2&lang=1 Český státní etalon hmotnosti v ČMI]
* Martin Žáček, [http://aldebaran.cz/bulletin/ Aldebaran bulletin] 28/2008: [http://www.aldebaran.cz/bulletin/2008_28_kil.php Nová definice kilogramu]
* [https://web.archive.org/web/20121103092214/http://www.horalek.org/clanky/SI%20jednotky.pdf SI jednotky]
* [http://www.bipm.org/en/scientific/mass/prototype.html Mezinárodní prototyp kilogramu]
* National Institute of Standards and Technology (NIST): ''[http://www.nist.gov/public_affairs/releases/electrokilogram.htm NIST Improves Accuracy of ‘Watt Balance’ Method for Defining the Kilogram]''
* The UK’s National Physical Laboratory (NPL): [https://web.archive.org/web/20090311010850/http://www.npl.co.uk/server.php?show=ConWebDoc.2087 An overview of the problems with an artifact-based kilogram]
* NPL: ''[https://web.archive.org/web/20090503084152/http://www.npl.co.uk/server.php?show=ConWebDoc.2050 Avogadro Project]''
* NPL: ''[https://web.archive.org/web/20090228060501/http://www.npl.co.uk/server.php?show=ConWebDoc.2029 NPL watt balance]''
* Metrology in France: ''[http://www.metrologiefrancaise.com/en/feature/watt-balance.asp Watt balance]''
* Australian National Measurement Institute: ''[httphttps://wwwweb.archive.org/web/20090915203950/http://measurement.gov.au/index.cfm?event=object.showContent&objectID=7CBA5E62-BCD6-81AC-15017BE81748EF4B Redefining the kilogram through the Avogadro constant]''
* International Bureau of Weights and Measures (BIPM): [http://www.bipm.org/en/home/ Home page]
* NZZ Folio: ''[http://www.nzzfolio.ch/www/d80bd71b-b264-4db4-afd0-277884b93470/showarticle/fb0ba22e-46b7-43a5-8320-ef16483b7e91.aspx What a kilogram really weighs]''
* NPL: ''[https://web.archive.org/web/20090327192726/http://www.npl.co.uk/server.php?show=ConWebDoc.1380 What are the differences between mass, weight, force and load?]''
* BBC: ''[http://news.bbc.co.uk/1/hi/sci/tech/7084099.stm Getting the measure of a kilogram]''
* NPR: ''[http://www.npr.org/templates/story/story.php?storyId=112003322 This Kilogram Has A Weight-Loss Problem]'', an interview with [[National Institute of Standards and Technology]] physicist Richard Steiner
 
=== Externí obrázky ===
* [https://web.archive.org/web/20110607032757/http://www.bipm.org/en/scientific/mass/pictures_mass/prototype.html] The IPK in three nested bell jars
* [http://patapsco.nist.gov/imagegallery/retrieve.cfm?imageid=49&dpi=72&fileformat=jpg] K20, the US National Prototype Kilogram
* [https://web.archive.org/web/20070926215612/http://www.bipm.org/en/scientific/mass/pictures_mass/cleaning.html] Steam cleaning a 1 kg prototype before a mass comparison
* [https://web.archive.org/web/20070926221138/http://www.bipm.org/en/scientific/mass/pictures_mass/vault.html] The IPK and its six sister copies in their vault
* [http://www.theage.com.au/ffximage/2007/06/14/rgN1506_csiro_wideweb__470x343,0.jpg] Silicon sphere for the Avogadro Project
* [https://web.archive.org/web/20090311005353/http://www.npl.co.uk/server.php?show=conMediaFile.1083] The NPL’s Watt Balance project
* [https://web.archive.org/web/20110608203501/http://museum.nist.gov/object.asp?ObjID=51] Rueprecht Balance, an Austrian-made precision balance, was used by the NIST from 1945 until 1960
* [https://web.archive.org/web/20070926215949/http://www.bipm.org/en/scientific/mass/research_mass/flexure-strip.html] The BIPM’s modern precision balance featuring a standard deviation of one ten-billionth of a kilogram (0.1 µg)
* [https://web.archive.org/web/20070926220910/http://www.bipm.org/en/scientific/mass/pictures_mass/mettler.html] Mettler HK1000 balance, featuring 1 µg resolution and a 4 kg maximum mass. Also used by NIST and Sandia National Laboratories’ Primary Standards Laboratory
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