TodaO91'

@inproceedings{DBLP:conf/coco/TodaO91,
  author    = {Seinosuke Toda and
               Mitsunori Ogiwara},
  title     = {Counting Classes Are at Least as Hard as the Polynomial-Time
               Hierarchy},
  booktitle = {Structure in Complexity Theory Conference},
  year      = {1991},
  pages     = {2-12},
  ee        = {http://dx.doi.org/10.1109/SCT.1991.160238},
  crossref  = {DBLP:conf/coco/1991},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/coco/1991,
  title     = {Proceedings of the Sixth Annual Structure in Complexity
               Theory Conference, Chicago, Illinois, USA, June 30 - July
               3, 1991},
  booktitle = {Structure in Complexity Theory Conference},
  publisher = {IEEE Computer Society},
  year      = {1991},
  isbn      = {0-8186-2055-5},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}