The DOI (Digital Object Identifier) is a persistent identifier or handle used to identify objects uniquely, standardized by the International Organization for Standardization (ISO).
Every DOI name is a unique series of alphanumerical characters and consists of two parts: the prefix and the suffix –separated by a forward slash. The prefix identifies the publication, so it is the same in every single document of a particular journal or book.The suffix identifies the articles and chapters in the publication, so they all have to be unique.
Benefits of DOI:
  • it is a persistent identifier, so DOI links will point to the document even if moved elsewhere from its original location;
  •  the DOI is an internationally widely used identifier, used by many publishers; so it may increase the visibility and discoverability of published documents.
DOI identifiers can be created through two agencies in Hungary:
The Library and Information Center of the Hungarian Academy of Sciences (MTA KIK) is a member of both CrossRef and DataCite. It can allocate DOIs for journal articles, books, PhD theses, publishers and editors.
DOIs registered with DataCite are for identification purposes only and they are currently available free of charge.
DOIs registered at CrossRef may increase visits to the website of the publication and the number of citations. DOIs can be purchased according to the current price of CrossRef.
DOI workflow at Szent István University:
The request for the DOI must be indicated at Kosáry Domokos Library and Archives.
The Library delivers detailed information and provides the contract form to be filled in.
The contract completed with all the required signatures will be forwarded by our Library to the DOI Desk at the MTA KIK.
The prefix is allocated by the DOI Desk of MTA KIK. When we receive the prefix of the DOI, and we pass it on to the requesting person. We also provide technical assistance regarding the suffix, since the publishers themselves add the suffix.

If the contract is made with CrossRef, in addition to creating the suffix, the editor is obliged to fulfil the so-called cross-linking requirements: the bibliography of articles / chapters should include the DOI identifier of each source (as a link in the electronic version) if they were also registered at CrossRef. Clients are expected to maintain the documents that have been assigned DOIs and maintain the URLs associated with their DOIs.

After creating the DOIs each printed copy of a document must include the DOI. The documents also must be made available in full text in good quality in PDF format, including the DOI identifier as well. In case of journal articles, the publisher must agree to store and published articles with assigned DOIs for at least 10 years on the periodical's website, and upload them to the Szent István University Archives and to REAL, the repository of MTA KIK.
In case of books and book chapters, full text access should be ensured as well. It is also recommended to upload these scientific publications to the Szent István University Archives and to REAL, the repository of MTA KIK.
After uploading and making available the documents, it is necessary to forward the metadata and the full text links to the MTA KIK DOI Desk,  so the data is entered in the global DOI system and the new DOIs can be resolved.
To acquire a DOI identifier, please contact us at:
  Phone: 0628/522-000 /ext. 1041
We gladly offer you advice and support in obtaining DOIs for your publication.