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| crossref_citation | Lookup article info via CrossRef with DOI and get a citation. |
| crossref_citation_count | Lookup article info via CrossRef with DOI and get a citation. |
| crossref_cn | Search the CrossRef Metatdata API. |
| crossref_openurl | Lookup article info via CrossRef with DOI. |
| crossref_r | Get a random set of DOI's through CrossRef. |
| crossref_search | Search the CrossRef Metatdata API. |
| crossref_search_free | Search the CrossRef Metatdata for DOIs using free form references. |
| formatcrossref | Convert crossref XML into a bibentry object |