Media type: E-Article Title: Logic Programming and Nonmonotonic Reasoning: On the Role of Negation in Choice Logic Programs Contributor: De Vos, Marina; Vermeir, Dirk Published: Springer Berlin Heidelberg, 1999 Published in: Logic Programming and Nonmonotonic Reasoning (1999), Seite 236-246 Language: Not determined DOI: 10.1007/3-540-46767-x_17 ISSN: 0302-9743 Origination: Footnote: