The aim of this paper is to review the existing catalogues of dissertations available through Internet as well as standards on which those catalogues are made. Various systems that store dissertations metadata were analyzed. The analyses found out that these systems are based on a number of standards, protocols and formats that enable interoperability of these systems: CERIF standard, AOI-PMH protocol, Dublin Core format, MARC 21 format, ETD-MS format. Based on this analysis within the CRIS UNS system is implemented a module for search of PhD dissertations in such a way that the dissertations metadata are in accordance with previously mentioned standards, protocols and formats.