Indexing
Google Scholar is a freely accessible web search engine that indexes the full text of scholarly literature across an array of publishing formats and disciplines. The Google Scholar index includes most peer-reviewed online journals of Europe and America's largest scholarly publishers, plus scholarly books and other non-peer reviewed journals. It is similar in function to the freely available Scirus from Elsevier, CiteSeerX, and getCITED. It is also similar to the subscription-based tools, Elsevier's Scopus and Thomson ISI's Web of Science.
Index Copernicus (IC) is an online database of user-contributed information, including scientist profiles, as well as of scientific institutions, publications and projects established in 1999 in Poland, and operated by Index Copernicus International. The database, named after Nicolaus Copernicus (who triggered the Copernican Revolution), has several assessment tools to track the impact of scientific works and publications, individual scientists, or research institutions. In addition to the productivity aspects, IC also offers the traditional abstracting and indexing of scientific publications.
BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 150 million documents from more than 7,000 sources. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.
The U.S. ISSN Center, part of the international ISSN Network, assigns International Standard Serial Numbers (ISSN) to serials published in the U.S. The ISSN is a standard identifier for serials (e.g., journals, magazines, newsletters, newspapers, annuals) whether published in print, online or other media. Each medium version is assigned a separate ISSN.
