In 2007 the scientific search engine Libra, developed by Microsoft Research Asia and successor of Windows Live Academic, was launched. With Libra, Microsoft introduces an object-oriented approach. For Libra, central elements of scientific publications (author, location, organization or topic) are extracted and classified from web pages, web databases (such as DBLP, CiteSeer or ACM Digital Library) and PDF documents and the information on the objects (cited by, published in) is summarized in so-called web objects. In addition to the documents, conferences and journals are also indexed as separate object classes. These different objects in turn form a so-called "Object graph", which also contains the relationship between the individual objects. The objects each have a different relevance, which flows into the ranking. In 2009 Libra will be replaced by Microsoft Academic Search.

Language English

Launched 2007
Closed 2010

Developer Microsoft Research Asia

Country of Origin China

2007 - 2010 Microsoft

Topic Academic, Scientific or Educational Search engine

Region No Limitation

Technical functionalities
Search engine for databases, repositories, portals and other closed (deep web) or open content collections

Used SeEn MSN Live Search

Older Version Internet Archive / WebCite


Critical points

Features & Functionality


References & further Publications

Wikipedia (EN):
Wikipedia (Others):

Other Sources

About Libra URL:
Nie, Z., Zhang, Y., Wen, J.-R., & Ma, W.-Y. (2005). Object-level ranking: Bringing order to web objects. In Proceedings of the 14th international conference on World Wide Web (WWW 05 ) (S. 567574). URL:
Ortega, J. L. (2014). Academic search engines: a quantitative outlook. Oxford: Chandos Publishing. URL:

Created: 2017-05-01