@article{cock41,
  title={The distribution of a product from several sources to numerous localities},
  author={Hitchcock, Frank L},
  journal={Journal of mathematics and physics},
  volume={20},
  number={1-4},
  pages={224 -- 230},
  year={1941},
  publisher={Wiley Online Library}
}

@article{ramdas17,
  title={On wasserstein two-sample testing and related families of nonparametric
         tests},
  author={Ramdas, Aaditya and Trillos, Nicolas Garcia and Cuturi, Marco},
  journal={Entropy},
  volume={19},
  number={2},
  pages={47},
  year={2017},
  publisher={Multidisciplinary Digital Publishing Institute}
}