https://www.crossref.org/blog/free-public-data-file-of-112-million-crossref-records/
Items tagged with oa.crossref in Open Access Tracking Project (OATP) 04/10/2020
https://www.crossref.org/documentation/flagging_free_to_read/
Items tagged with oa.crossref in Open Access Tracking Project (OATP) 03/23/2020
https://doi.org/10.1162/qss_a_00022
Items tagged with oa.crossref in Open Access Tracking Project (OATP) 02/22/2020
https://blog.doaj.org/2020/02/12/doaj-to-add-crossref-compatibility/
Items tagged with oa.crossref in Open Access Tracking Project (OATP) 02/12/2020
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