Major Citation Indexing Services
General-purpose academic citation indexes include:
- ISI (now part of Thomson Scientific) publishes the ISI citation indexes in print and compact disc. They are now generally accessed through the Web under the name Web of Science, which is in turn part of the group of databases in the Web of Knowledge.
- Elsevier publishes Scopus, available online only, which similarly combines subject searching with citation browsing and tracking in the sciences and social sciences.
- Indian Citation Index is an online citation data which covers peer reviewed journals published from India. It covers major subject areas such as scientific, technical, medical, and social sciences and includes arts and humanities. The citation database is the first of its kind in India.
Each of these offer an index of citations between publications and a mechanism to establish which documents cite which other documents. They differ widely in cost: the ISI databases and Scopus are available by subscription (generally to libraries).
In addition, CiteSeer and Google Scholar are freely available online.
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