Update. #SCOPUS and #WOS are also very incomplete at indexing #preprints. See this new study comparing them to #Dimensions, #Lens, and #EuropePMC.
https://upstream.force11.org/the-preprint-revolution-implications-for-bibliographic-databases/

The preprint revolution - Implications for bibliographic databases https://upstream.force11.org/the-preprint-revolution-implications-for-bibliographic-databases/

Bibliographic databases are increasingly recognizing importance of preprints. How do they index preprints?

@neesjanvaneck and I offer 6 recommendations for preprint indexing. We show to what extent #Dimensions, #EuropePMC, #Lens, #Scopus and #WebOfScience meet these recommendations.

Improving preprint indexing requires joint action by many players in scholarly publishing infrastructure ecosystem!

@cwts

@Luke_Drury @cwts @neesjanvaneck Thanks Luke, I must admit I'm not familiar with the ADS system, but this sounds great.

There are also various multidisciplinary databases that have been indexing preprints already for some time, including #Dimensions, #Lens and #EuropePMC. We'll discuss this in the blog post that we're working on.