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Dead link tags per 
For journal articles one can just remove the urls if they are dead rather than tagging them as long as either a PMID or DOI is present. (the url just means there was once a freely viewable version and there is not any more)
If an archive url is present such as this one was  adding a second dealink tag is not needed, especially as one dead link tag was already there
If links are dead it is much more useful to add an archive.org link. We really need a bot to do this for all our urls. Will look at seeing if I can convince anyone to build one.  (talk · contribs · email) "