1. Beck, J., Sequeira, E.: PubMed Central (PMC): An archive for literature from life sciences journals. In: McEntyre, J., Ostell, J. (eds.) The NCBI Handbook, ch. 9. National Center for Biotechnology Information, Bethesda (2003), http://www.ncbi.nlm.nih.gov/books/NBK21087/
2. SCI,2012
3. Bizer, C., Lehmann, J., Kobilarov, G., Auer, S., Becker, C., Cyganiak, R., Hellmann, S.: DBpedia – a crystallization point for the web of data. Journal of Web Semantics: Science, Services and Agents on the World Wide Web 7, 154–165 (2009)
4. Feldman, R., Sanger, J. (eds.): The Text Mining Handbook. Cambridge University Press (2007)
5. Gabrilovich, E., Markovitch, S.: Computing semantic relatedness using Wikipedia-based explicit semantic analysis. In: Proceedings of the 20th International Joint Conference on Artificial Intelligence, pp. 6–12 (2007)