Search on Google Scholar or directly on the journal website and copy/paste the url of the article you are interested in in the "search" box of SciHub. It worked for me 2 days ago while the search was down.
It's currently the target of government intervention, or at least strangers on the internet have claimed so. There's 20-40 terabytes of data available through SciHub, so making a backup is non-trivial.
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[ 2.9 ms ] story [ 21.1 ms ] threadPrevious discussion before that: https://news.ycombinator.com/item?id=11074638
And the one before that: https://news.ycombinator.com/item?id=11070192
It is a world changing web site that's been long coming, but perhaps could be short lived.