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I know why you did it, but in format in which you added the derived information is a form of WP:SYN and is against the OR policy. As I wrote above there are several other options available to you to convey the same information. Another way is to say ""Abc writing in 1866 states, this is not supported/contradicted by Xyz's more modern research"", such wording does not draw a conclusion but states the facts.    "