@article{towardsatopologicalgeometricaltheoryof,
  title = {Towards a topological-geometrical theory of group equivariant non-expansive operators for data analysis and machine learning},
  author = {Mattia G. Bergomi and Patrizio Frosini and Daniela Giorgi and Nicola Quercioli},
  year = {2018},
  eprint = {1812.11832},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1812.11832v3},
}