An upper limit to the variation in the fundamental constants at redshift z = 5.2

Author： Levshakov S. A.   Combes F.   Boone F.   Agafonova I. I.   Reimers D.   Kozlov M. G.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|540|issue|L9-L9

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.540, Iss.issue, 2012-04, pp. : L9-L9

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