We are happy to announce that all published paper have a DOI (Digital Object Identifier). Therefore, each paper has its one identifier binding to its metadata. The DOI for a paper remains fixed over the lifetime of the document, whereas its location and other metadata may change. A DOI provides more stable linking than simply using its URL, since the URL may change during the time ( for instance, the hosting and domain). When such change occurs, REABTIC only needs to update the metadata for the DOI to link to the new URL.