Reihe Lecture Notes in Artificial IntelligenceFrithjof Dau × The Logic System of Concept Graphs with NegationAnd Its Relationship to Predicate LogicFrithjof DauSpringer BerlineBook2003 The Logic System of Concept Graphs with NegationAnd Its Relationship to Predicate LogicFrithjof DauSpringer BerlinSoftcover2003