@InCollection{ bredix00, author = {Gerhard Brewka and J\"{u}rgen Dix}, title = {Knowledge Representation with Extended Logic Programs}, booktitle = {Handbook of Philosophical Logic, 2nd Edition, Volume 6, Methodologies}, publisher = {Reidel Publ.}, year = {2004}, editor = {D. Gabbay and F. Guenthner}, chapter = {6}, pages = {}, note = {Shortened version also appeared in Dix, Pereira, Przymusinski (Eds.), \emph{Logic Programming and Knowledge Representation}, Springer LNAI 1471, pages 1--55, 1998.} }