Information retrieval is the activity of obtaining information resources relevant to an information need from a collection of information resources. (Says Wikipedia).
The included documents are
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Graph of Word and TW-IDF - Francois Rousseau & Michalis Vazirgiannis
The traditional IR system stores term-specific statistics (typically a term's frequency in each document - which we call TF) in an index. Such a model ignores dependencies between terms and considers a document's terms to occur independently of each other (and is aptly called the bag-of-words model). In this paper the authors use a statistic that uses a graph representation of a document to encode dependencies between terms and replace the TF statistic with a new TW statistic based on the graph constructed and achieve significantly better results that popular existing models. This paper won a honorable mention at CIKM 2013.