Scirus was a comprehensive science-specific search engine. Like CiteSeerX and Google Scholar, it was focused on scientific information. Unlike CiteSeerX, Scirus was not only for computer sciences and IT and not all of the results included full text. It also sent its scientific search results to Scopus, an abstract and citation database covering scientific research output globally. Scirus was owned and operated by Elsevier. In 2013 an announcement appeared, on the Scirus homepage, announcing the sites retirement in 2014:
We are sad to say goodbye. Scirus is set to retire in early 2014. An official retirement date will be posted here as soon as it is determined. To ensure a smooth transition, we are informing you now so that you have sufficient time to find an alternative search solution for science-specific content. Thank you for being a devoted user of Scirus. We have enjoyed serving you.
The Scirus homepage currently (Feb 2014) indicates that the service is no longer running.
Boswell, Wendy. "Scirus". About.com. Retrieved 11 February 2013.
Ford, Lyle; O'Hara, Lisa Hanson (2008). "It's All Academic: Google Scholar, Scirus, and Windows Live Academic Search". Journal of Library Administration46 (3-4): 43–52. doi:10.1300/J111v46n03_04.Cite uses deprecated parameters (help)
Giustini, Dean; Eugene Barsky (2005). "A look at Google Scholar, PubMed, and Scirus: comparisons and recommendations". Journal of the Canadian Health Libraries26: 85–89.Cite uses deprecated parameters (help)
Mayr, Philipp; Walter, Anne-Kathrin (2007). "An exploratory study of Google Scholar". Online Information Review31 (6): 814–830. doi:10.1108/14684520710841784.Cite uses deprecated parameters (help)
Notess, Greg R (July–August 2005). "Scholarly Web Searching: Google Scholar and Scirus". Online29 (4) (Information Today, Inc.).|accessdate= requires |url= (help)