@inproceedings{ijcai2009p20,
  title     = {A Multivariate Complexity Analysis of Determining Possible Winners Given Incomplete Votes},
  author    = {Betzler, Nadja and Hemmann, Susanne and Niedermeier, Rolf},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {53--57},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/20},
}