[cycomanic]

The issue is that none of the citation count engines (Google scholar, scopus, Web of Science...) count citations on those DOIs. So for a researcher who needs to somehow demonstrate impact through citation counts, it does not really help unfortunately.

[westurner]

We could reason about sites that index https://schema.org/ScholarlyArticle according to our own and others' observations. Google Scholar, Semantic Scholar, and Meta all index Scholarly Articles: they copy the bibliographic metadata and the abstract for archival and schoarly purposes.

AFAIU, e.g. Zotero and Mendeley do not crawl and index articles or attempt to parse bibliographic citations from the astounding plethora of citation styles [citationstyles, citationstyles_stylerepo] into a citation graph suitable for representative metrics [zenodo_newmetrics].

bitcoin.org/bitcoin.pdf does not have a DOI, does not have an ORCID [orcid], and is not published in any journal but is indexed by e.g. Google Scholar; though there are apparently multiple records referring to a ScholarlyArticle with the same name and author. Something like "Hell's Angels" (1930)? No DOI, no ORCID, no parseable PDF structure: not indexed.

AFAIU, Google Scholar does not yet index ScholarlyArticle (or SoftwareApplication < CreativeWork) bibliographic metadata. GScholar indexes an older set of bibliographic metadata from HTML <meta> tags and also attempts to parse PDFs. [gscholar_inclusion]

Google Scholar is also not (yet?) integrated with Google Dataset Search (which indexes https://schema.org/Dataset metadata).

FigShare DOIs and Zenodo DOIs are DataCite DOIs [figshare_howtocite, zenodo_principles]; which apparently aren't (yet?) all indexed by Google Scholar [rescience_gscholar].

IIUC, all papers uploaded to https://arxiv.org are indexed by Google Scholar. In order for arxiv-vanity.org [arxiv_vanity] to render a mobile-ready, font-resizeable HTML5 version of a paper uploaded to ArXiV, the PostScript source must be uploaded. Arxiv hosts certain categories of ScholarlyArticles.

JOSS (Journal of Open Source Software) has managed to get articles indexed by Google Scholar [rescience_gscholar]. They publish their costs [joss_costs]: $275 Crossref membership, DOIs: $1/paper:

> Assuming a publication rate of 200 papers per year this works out at ~$4.75 per paper

[citationstyles]: https://citationstyles.org

[citationstyles_stylerepo]: https://github.com/citation-style-language/styles

[gscholar_inclusion]: https://scholar.google.com/intl/en/scholar/inclusion.html#in...

[figshare_howtocite]: https://knowledge.figshare.com/articles/item/how-to-share-ci...

[zenodo_principles]: https://about.zenodo.org/principles/

[zenodo_newmetrics]: https://www.frontiersin.org/articles/10.3389/frma.2017.00013...

[rescience_gscholar]: https://github.com/ReScience/ReScience/issues/38

[arxiv_vanity]: https://www.arxiv-vanity.com/

[joss_costs]: https://joss.theoj.org/about#costs

[orcid]: https://en.wikipedia.org/wiki/ORCID