@article{whenistherearepresentertheorem,
  title = {When is there a Representer Theorem? Nondifferentiable Regularisers and Banach spaces},
  author = {Kevin Schlegel},
  year = {2018},
  eprint = {1804.09605},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1804.09605v1},
}