https://www.crossref.org/services/content-registration/ We store metadata and DOIs for many types of research-related content. The content types that we currently accept are below. If you have a content type that isn’t listed please contact us. At the moment we’re developing schemas for grants, conferences, and projects. - Journals and journal articles: at the journal title and article level and includes supplemental materials. - Books, chapters, and reference works: book title and/or chapter-level records, books can be deposited as a monograph, series, or set. Read our best practice for book content. - Conference proceedings: information about a single conference and records for each conference paper/proceeding. - Reports/working papers: this includes content that is formally published and is published with an ISSN or ISBN. - Standards: includes publications from Standards Development Organizations and Standards Setting Organizations. - Datasets: includes database records or collections. (See also DataCite. - Dissertations: includes single dissertations and theses - not collections. - Preprints: consists of preprints, eprints, working papers, reports, and other types of content that has been posted but not formally published. - Peer reviews: any number of reviews, reports, or comments attached to an associated article. - Components: typically assigned to parts of a whole, most commonly including figures, tables, and supplemental materials for a journal article or book chapter.