@inproceedings{conf/coco/Gottlob96,
  title = "Collapsing Oracle-Tape Hierarchies",
  author = "Georg Gottlob",
  year = "1996",
  booktitle = "{IEEE Conference on Computational Complexity}",
  pages = "33-42",
  url = "http://www.computer.org/proceedings/ccc/7386/73860033abs.htm",
}