@article{HK16,
  title = "The complexity of the $K$th largest subset problem and related problems",
  author = "Christoph Haase and Stefan Kiefer",
  year = "2016",
  journal = "Inf. Process. Lett.",
  number = "2",
  pages = "111--115",
  volume = "116",
  doi = "10.1016/j.ipl.2015.09.015",
}