title = {Nonmonotonicity and the Scope of Reasoning.},
author = {David W. Etherington and Sarit Kraus and Donald Perlis}, journal = {Artif. Intell.}, number = {3}, pages = {221-261}, url = {http://dblp.uni-trier.de/db/journals/ai/ai52.html#EtheringtonKP92}, volume = {52}, year = {1992}, description = {dblp}, date = {2003-11-19},
keywords = {dblp }
::