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Soderland, S. 1997. Learning text analysis rules for domain-specific natural language processing. Submitted to the Graduate School of the University of Massachusetts Amherst in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Computer Science Department at the University of Massachusetts. 

Universidad de Sheffield. Information Extraction. Grupo de Procesamiento del Lenguaje Natural. Departamento de Ciencias de la Computación. 2002. http://nlp.shef.ac.uk/research/areas/ie.html</referencetext>
