29. The computer-implemented method of claim 25 , wherein assigning each document from a plurality of documents to one or more document groups comprises: assigning the documents based on one or more features of the documents, wherein the one or more features include at least one of: title; place of publication; other documents referenced by the documents; other documents that reference the documents; or names of authors.
29. The computer-implemented method of claim 25 , wherein assigning each document from a plurality of documents to one or more document groups comprises: assigning the documents based on one or more features of the documents, wherein the one or more features include at least one of: title; place of publication; other documents referenced by the documents; other documents that reference the documents; or names of authors. 30. The computer-implemented method of claim 29 , wherein, when the one or more features include proper names of authors, the one or more features of the documents further include at least one of author email addresses or author affiliations.