Published in
Astronomy & Astrophysics, (540), p. L9, 2012
DOI: 10.1051/0004-6361/201219042
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An upper limit to the variation in the fundamental constants at redshiftz= 5.2
Journal article published in 2012 by
S. A. Levshakov,
F. Combes 
,
F. Boone,
I. I. Agafonova,
D. Reimers,
M. G. Kozlov
,
F. Boone,
I. I. Agafonova,
D. Reimers,
M. G. Kozlov
This paper was not found in any repository, but could be made available legally by the author.
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