Opkwark: Verskil tussen weergawes
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Lyn 18:
| massa={{val|2.3|+0.7|-0.5|ul=MeV/c2}}<ref name="PDG2012">
{{cite web
|author=J. Beringer (Particle Data Group)
|url=http://pdg.lbl.gov/2012/tables/rpp2012-sum-quarks.pdf
|title=PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b', t', Free)'
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