@article{kappalearninganewmethodformeasuring,
  title = {Kappa Learning: A New Method for Measuring Similarity Between Educational Items Using Performance Data},
  author = {Tanya Nazaretsky and Sara Hershkovitz and Giora Alexandron},
  year = {2018},
  eprint = {1812.08390},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1812.08390v1},
}