@techreport{Covington:1994:3,
        title = {{GULP} 3.1: An Extension of Prolog for Unification-Based Grammar},
        author = {Michael A. Covington},
        institution = {Artificial Intelligence Center, The University of Georgia},
        number = {AI-1994-06},
        year = 1994,
        url = {http://www.ai.uga.edu/\~{}mc/},
        biburl = {http://www.bibsonomy.org/bibtex/26bc9bb8718cb309bbffb3ae720d3a221/diego_ma},
	keywords = {NLP grammar prolog},
    }