@article{degreesoffreedomandmodelselectionfor,
  title = {Degrees of Freedom and Model Selection for k-means Clustering},
  author = {David P. Hofmeyr},
  year = {2018},
  eprint = {1806.02034},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1806.02034v4},
}