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2009MmSAI..80..882M - Mem. Soc. Astron. Ital., 80, 882-887 (2009)
New limit on a varying proton-to-electron mass ratio from high-resolution optical quasar spectra.
MALEC A.L., BUNING R., MURPHY M.T., MILUTINOVIC N., ELLISON S.L., PROCHASKA J.X., KAPER L., TUMLINSON J., CARSWELL R.F. and UBACHS W.
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