Patent 9514113 was granted and assigned to Google on December, 2016 by the United States Patent and Trademark Office.
A method includes accessing a document and generating a ranking score for each of a plurality of passages from external documents. The ranking score is based at least on a degree of semantic similarity of each passage with respect to a portion of the document. The method also includes modifying the document to include a footnote link for the portion of the document, the footnote link including a link to the external document having the highest ranked passage therein, if the ranking score of the highest ranked passage with respect to the portion of the document exceeds a threshold value. The document is not modified to include the footnote link for the portion of the document if the ranking score of the highest ranked passage with respect to the portion of the document does not exceed a threshold value.