Meta tags for Google Scholar

[ajkiessl]

From Google Scholar:

Articles appear to be missing machine-readable bibliographic metadata in the form of "citation_XX" metatags that the Scholar system uses for indexing

Example from scholarsphere:

<!-- Google Scholar metadata -->
<meta name="citation_title" content="Title of Publication">
  <meta name="citation_author" content="Author 1">
  <meta name="citation_author" content="Author 2">
<meta name="citation_publication_date" content="2022">
  <meta name="citation_pdf_url" content="https://scholarsphere.psu.edu/resources/b74bdd73-07fc-45d3-abed-cb6ac89fda87/downloads/21069">

[ajkiessl]

Scholarsphere code: https://github.com/psu-libraries/scholarsphere/blob/d03c18d13fc13eccca868abdcf4d12be1b514c43/app/components/google_scholar_metadata_component.html.erb

Note that we only want to include a single 'citation_pdf_url' meta tag.