online publication
Which is the correct entry type for an online publication of a PDF?
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It is not part of a book
It is not part of a journal
It is certainly not a government report
It is simply an article, published only as PDF as far as I can see, and only distributed through a website. It is certainly not a book. I have so far categorised it as a webpage, but that's not really what it is, either.
Such independent articles are becoming more and more the norm for small scale scientific research.