@article{JMLR:v22:21-0575,
  author  = {Zhengze Zhou and Lucas Mentch and Giles Hooker},
  title   = {V-statistics and Variance Estimation},
  journal = {Journal of Machine Learning Research},
  year    = {2021},
  volume  = {22},
  number  = {287},
  pages   = {1--48},
  url     = {http://jmlr.org/papers/v22/21-0575.html}
}