| as.tdmurl-defunct | Coerce a url to a tdmurl with a specific type |
| cr_abstract | Get abstract |
| cr_agency | Check the DOI minting agency on one or more dois |
| cr_citation_count | Get a citation count via CrossRef OpenURL |
| cr_citation-defunct | This function is defunct |
| cr_cn | Get citations in various formats from CrossRef. |
| cr_ft_links-defunct | Get full text links from a DOI |
| cr_ft_pdf-defunct | Get full text pdf from a DOI |
| cr_ft_plain-defunct | Get full text plain from a DOI |
| cr_ft_text-defunct | Get full text from a DOI |
| cr_ft_xml-defunct | Get full text xml from a DOI |
| cr_funders | Search the CrossRef Fundref API |
| cr_fundref-defunct | fundref |
| cr_journals | Search CrossRef journals |
| cr_licenses | Search CrossRef licenses |
| cr_members | Search CrossRef members |
| crosscite-defunct | Crosscite - citation formatter |
| cr_prefixes | Search CrossRef prefixes |
| cr_r | Get a random set of DOI's through CrossRef. |
| cr_search-defunct | Search the CrossRef Metadata API. |
| cr_search_free-defunct | Search the CrossRef Metadata for DOIs using free form... |
| cr_types | Search CrossRef types |
| cr_works | Search CrossRef works (articles) |
| extract_xpdf-defunct | Extract text from a single pdf document. |
| filters | Get filter details and names. |
| GET_agency_id | Get doi agency id to identify resource location |
| get_styles | Get list of styles from... |
| id_converter | Get a PMID from a DOI, and vice versa. |
| pmid2doi-defunct | Get a PMID from a DOI, and vice versa. |
| rcrossref-defunct | Defunct functions in rcrossref |
| rcrossref-deprecated | Deprecated functions in rcrossref |
| rcrossref-package | rcrossref |
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