Actually the relevant discipline here is philology, worked out by the scholars of Ancient Alexandria in the third century BC or so to clear out the crap from the manuscripts of Homer (the bigger the ms, the better the price, so people had an incentive to pump them up), much later adapted by linguists to work out the relationship between languages. Perens and Raymond seem to know the relevant methods, wherever they may have picked them up from.
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Actually the relevant discipline here is philology, worked out by the scholars of Ancient Alexandria in the third century BC or so to clear out the crap from the manuscripts of Homer (the bigger the ms, the better the price, so people had an incentive to pump them up), much later adapted by linguists to work out the relationship between languages. Perens and Raymond seem to know the relevant methods, wherever they may have picked them up from.