A survey on free versions of PubMed and Infotrieve and comparing them with the commericial versions of Ebsco and FirstSearch of Medline Database

Document Type : Research َ Article

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  • Receive Date: 18 October 2005
  • Revise Date: 29 November 2015
  • Accept Date: 29 November 2015
  • Publish Date: 20 February 2007