Media type: E-Article Title: Non-Monotonic Extensions of Logic Programming: Aggregation and well-founded semantics+ Contributor: Osorio, Mauricio; Jayaraman, Bharat imprint: Springer Berlin Heidelberg, 1997 Published in: Non-Monotonic Extensions of Logic Programming Language: Not determined DOI: 10.1007/bfb0023802 ISSN: 1611-3349; 0302-9743 Origination: Footnote: