@book{OPUS4-18498,
  title     = {Proceedings of the Fifth Dutch German Workshop on Nonmonotonic Reasoning Techniques and their Applications, DGNMR'2001, Potsdam, 4. - 6. April 2001},
  editor    = {Gerhard Brewka and Cees Witteveen and Torsten H. Schaub},
  year      = {2001},
}