ResourceShelf » A Quick Look of a Few Free Science Search Tools (Scirus, Live Search Academic, Google Scholar, Scitopia, Global Science Gateway, and More

http://www.resourceshelf.com/2007/07/09/a-quick-look-of-a-few-free-science-search-tools-scirus-live-search-academic-google-scholar-scitopia-global-science-gateway-and-more/