particularly in library and information sciences, The Grey Journal. The Grey Journal appears three times a year –in spring, summer, and autumn. Each issue in a volume is thematic and deals with one or more related topics in the field of grey literature. The Grey Journal appears both in print and electronic formats. The electronic version on article level is available via EBSCO's LISTA-FT Database (EBSCO Publishing). The Grey Journal is indexed by Scopus and others. On 16 May 2014, the Pisa Declaration on Policy Development for Grey Literature Resources was ratified and published. See also Alternative media European Association for Grey Literature Exploitation Grey Literature International Steering Committee Grey Literature Network Service OpenSIGLE System for Information on Grey Literature in Europe References Further reading Cedefop; Eurolib. "EU grey literature: long-term preservation, access, and discovery". Luxembourg: Publications Office of the European Union, 2012. Available: http://www.cedefop.europa.eu/EN/Files/6115_en.pdf Hirtle, Peter. 1991. Broadsides vs. Gray Literature P. Pejsova (ed.) (2010). Grey Literature Repositories. Radim Bacuvcik VeRBuM, Zlin CZ. J. Schöpfel & D. J. Farace (2010). `Grey Literature'. In M. J. Bates & M. N. Maack (eds.), Encyclopedia of Library and Information Sciences, Third Edition, pp. 2029–2039. CRC Press. White, Herbert. 1984. Managing the Special Library. White Plains, N. Y.: Knowledge Industries Publications, Inc. External links About grey literature in medical systematic reviews GreyNet International Science.gov: a gateway to over 50 million pages of authoritative selected science information provided by U.S. government agencies, including research and development results. Science Accelerator searches science, including R&D results, project descriptions, accomplishments, and more, via resources made available by the Office of Scientific and Technical Information (OSTI), U.S. Department of Energy The GrayLIT network: A science portal of technical reports . From the Office of Scientific & Technical Information at the United States Department of Energy. Grey Literature Library for UK Archaeology The International Journal on Grey Literature published one volume in 2000. Content may be limited to subscribers. OpenGrey Repository, formerly OpenSIGLE Technical communication Publishing