CiteSeerX is a public search engine for scientific and academic papers primarily with a focus on computer and information science. However, CiteSeerX has been expanding into other scholarly domains such as economics, physics and others (Wikipedia).
To fetch entries from CiteSeerX, choose Search -> Web search, and the search interface will appear in the side pane. Select CiteSeerX in the dropdown menu. To start a search, enter the words of your query, and press Enter or the Fetch button.
The results are displayed in the import inspection window. In case an error occurs, it is shown in a popup.