CrossRef is an association of scholarly publishers that develops shared infrastructure to support more effective scholarly communications. In the 14 years since CrossRef launched, it has developed a number of services that hinge around the Digital Object Identifier (DOI) and the publication metadata submitted to CrossRef by publishers registering DOIs. CrossMark and FundRef are two additional services from CrossRef that publishers can choose to participate in, and both require publishers to provide additional information with the bibliographic metadata provided within their CrossRef deposits. This article will aim to show what this additional metadata is, how it should be formatted and why, so that publishers can use it to enhance their content and participate in additional CrossRef services that benefit the scholarly communications industry.

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CrossRef (http://www.crossref.org) is a not-for-profit membership association of publishers. Since its founding in 2000, CrossRef has provided reference linking services for over 62 million scholarly content items, including journal articles, books and book chapters, conference proceedings, reference entries, technical reports, standards, and data sets. CrossRef also provides additional collaborative services designed to improve trust in the scholarly communications process, including Cited-By linking, CrossCheck plagiarism screening, CrossMark update identification, and the FundRef funder identification service. All of these services continue to develop to try to meet the evolving needs of publishers, and this article attempts to give an overview of them and highlight important updates which have taken place over the last 12 months.

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