@article{JMLR:v21:19-246,
  author  = {Yu Liu and Kris De Brabanter},
  title   = {Smoothed Nonparametric Derivative Estimation using Weighted Difference Quotients},
  journal = {Journal of Machine Learning Research},
  year    = {2020},
  volume  = {21},
  number  = {65},
  pages   = {1--45},
  url     = {http://jmlr.org/papers/v21/19-246.html}
}