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Nature|May 31, 1979
0957 + 561 A, B: twin quasistellar objects or gravitational lens?D Walsh, R F Carswell, R J Weymann
Physical Review Letters|December 21, 2011
Indications of a spatial variation of the fine structure constantJ K Webb, J A King, M T Murphy, et al.
Nature|July 17, 1997
A high deuterium abundance at redshift z = 0.7J K Webb, R F Carswell, K M Lanzetta, et al.
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