@article{sphericalwardsclusteringandgeneralized,
  title = {Spherical Wards clustering and generalized Voronoi diagrams},
  author = {Marek Śmieja and Jacek Tabor},
  year = {2017},
  eprint = {1705.02232},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1705.02232v1},
}