Impressively the paper seems to have been cited 50 times already. I don't mind much if its taken down or not, but with the old guard publishers you can at least get a redaction notice or comment about the issues with a paper embedded in the publication. If you find this paper cited somewhere and follow it to the source at arxiv, you will never be made aware of the disputes surrounding the research. Preprint servers has somewhat of a weakness here.
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