@article{JMLR:v23:21-1043,
  author  = {Vladimir Pestov},
  title   = {A universally consistent learning rule with a universally monotone error},
  journal = {Journal of Machine Learning Research},
  year    = {2022},
  volume  = {23},
  number  = {157},
  pages   = {1--27},
  url     = {http://jmlr.org/papers/v23/21-1043.html}
}