@inproceedings{DBLP:conf/ecsqaru/Schaub91,
  author = {Schaub, Torsten},
  title = {On Commitment and Cumulativity in Default Logics},
  booktitle = {{ECSQARU}},
  series = {Lecture Notes in Computer Science},
  volume = {548},
  pages = {305--309},
  publisher = {Springer},
  year = {1991}
}