Маса — разлика између измена

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* {{cite web |author=L. B. Okun |url=http://arxiv.org/pdf/physics/0111134.pdf |publisher=Nuclear Physics |title=Photons, Clocks, Gravity and the Concept of Mass |date=15 Nov 2001 |accessdate=3 Dec 2013}}
* {{cite web |url=http://video.mit.edu/watch/the-origin-of-mass-and-the-feebleness-of-gravity-9082/ |title=The Origin of Mass and the Feebleness of Gravity |author=[[Frank Wilczek]] |date = 13. 05. 2001. |publisher=MIT Video |type=video |accessdate=3 Dec 2013}}
* {{cite web |url=http://math.ucr.edu/home/baez/physics/Relativity/SR/mass.html |title=Does mass change with velocity? |author=[[John Baez]] |display-authors=etal |year=2012 |accessdate=3 Dec 2013 |archive-url=https://web.archive.org/web/20070630144936/http://math.ucr.edu/home/baez/physics/Relativity/SR/mass.html |archive-date=30. 06. 2007 |dead-url=yes |df= }}
* {{cite web |url=http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html |title=What is the mass of a photon? |author=[[John Baez]] |display-authors=etal |year=2008|accessdate=3 Dec 2013}}
* {{cite web |url=http://nssdc.gsfc.nasa.gov/planetary/lunar/apollo_15_feather_drop.html |title=The Apollo 15 Hammer-Feather Drop |publisher=NASA |last=Williams|first=David R. |date = 12. 02. 2008. |accessdate=3 Dec 2013}}
Преузето из „https://sr.wikipedia.org/wiki/Маса