@INPROCEEDINGS{Kern-Isberner01gKR02,
  AUTHOR = {G. Kern-Isberner},
  TITLE  = {A structural approach to default reasoning},
  BOOKTITLE = {Proceedings of the Eighth International Conference on Principles of Knowledge Representation and Reasoning, {KR'2002}}, 
  PUBLISHER = {Morgan Kaufmann},
  ADDRESS = {San Francisco, Ca.},
  PAGES =  {147-157},
  YEAR   = 2002    }