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Reply to Flambaum and Porsev comment arXiv:1004.2540 on "21 cm radiation - a new probe of variation in the fine structure constant" arXiv:astro-ph/0701752
R. Khatri and B. D. Wandelt, Physical Review Letters 98
2007
Earlier work this paper cites.
V. V. Flambaum and S. G. Porsev, Physical Review Letters 105
2010
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