We have publicly launched Rexa, a new research paper search engine. It is a sibling to CiteSeer and Google Scholar, except that it provides search and browsing over more "object types", including not just papers, but also people, grants and topics.

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Quote text and notes from Wikiquote: Andrew McCallum (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.