@article{DBLP:journals/jancl/LinkeS97,
  author = {Linke, Thomas and Schaub, Torsten},
  title = {Towards a classification of Default Logics},
  journal = {Journal of Applied Non-Classical Logics},
  volume = {7},
  number = {4},
  pages = {397--451},
  year = {1997}
}