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Ferreira, M.C. (author), Juliao, M.D. (author), Martins, C.J.A.P, (author), Monteiro, A.M.R.V.L. (author)We point out that existing astrophysical measurements of combinations of the fine-structure constant ?, the proton-to-electron mass ratio ? and the proton gyromagnetic ratio gpgp towards the radio source PKS1413+135 can be used to individually constrain each of these fundamental couplings. While the accuracy of the available measurements is not...journal article 2013