Group of Companies MedExpert was the first publisher in Ukraine registered in CrossRef, became a member of the Publisher International Linking Association (PILA), and was granted Digital Object Identifier (DOI).

CrossRef's general purpose is to promote the development and cooperative use of new and innovative technologies to speed and facilitate scholarly research. CrossRef’s specific mandate is to be the citation linking backbone for all scholarly information in electronic form. CrossRef is a collaborative reference linking service that functions as a sort of digital switchboard. It holds no full text content, but rather effects linkages through CrossRef Digital Object Identifiers (CrossRef DOI), which are tagged to article metadata supplied by the participating publishers. The end result is an efficient, scalable linking system through which a researcher can click on a reference citation in a journal and access the cited article.

CrossRef bring together publishing organizations all over the world representing 20 thousand scientific publications and 1,500 libraries, providing the crosslink between publications in scientific journals more than 2,800 publishers with a digital object identification. Using DOI will be able for us to represent scientific achievements in the world scientific community, improve the exchange of medical information between scholars, enhance the ranking of national journals in the international information field, and thus, will provide the raise citation indexes for our scientists beyond Ukraine.

Implementation of CrossRef DOI considerably enhances the publishing activities with broad community connections outside Ukraine, and enables the researcher’s scientific data to be represented in the world abstract and citation databases of peer-reviewed literature. CrossRef allows the user to move fr om one article to another at the citation level, regardless of journal or publisher. Without full-text citation linking, the user who discovers a desired resource while reading usually has to switch to a different search interface to locate and ultimately access that resource. CrossRef-enabled articles are easier to find and link to.

Since 2014 Group of Companies MedExpert began to assign CrossRef DOI to articles published in its journals.