9. The apparatus of claim 6 , wherein the processing means includes: means for removing from the paired paragraphs, noise words that convey little information about the content of the paragraphs; and means for stemming the words of the pair of paragraphs to a length that preserves their essential character while eliminating characters that convey little information about the word's identity.
6. An apparatus for selecting content words from a document based on degree of relevance to a cited document, implemented using a computer system including a processor, memory, and computer programs executed by the processor, wherein the processor interacts with a human user through a user interface, the apparatus comprising: means implemented by the computer system for pairing paragraphs of at least a first document, wherein at least a first paragraph of the pair of paragraphs contains at least one citing instance of a second, cited document; means implemented by the computer system for processing text in the pair of paragraphs to eliminate text that conveys little about the content of the paragraphs; means implemented by the computer system for identifying content words that are not eliminated by the processing means and that are common to both paragraphs of the pair of paragraphs; means implemented by the computer system for tallying a frequency count for each identified content word by adding one to the number of times the identified content word is in both paragraphs of the pair of paragraphs; and means implemented by the computer system for forming a content word list including the identified content words linked to respective content scores.