Werner Saurer. A Natural Deduction System for Discourse Representation Theory.  Technical report, CLAUS-Report 16, Universität des Saarlandes, Saarbrücken, December  1991.
 @TechReport{Saurer:1991,
        AUTHOR = {Saurer, Werner},
        TITLE = {A Natural Deduction System for Discourse Representation Theory},
        YEAR = {1991},
        MONTH = {December},
        NUMBER = {16},
        ADDRESS = {Saarbrücken},
        TYPE = {CLAUS-Report},
        INSTITUTION = {Universität des Saarlandes} } 
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