@ARTICLE{Ling-Findnumederiunst:06,
  author       = {Ling, L.},
  title        = {Finding numerical derivatives for unstructured and noisy data by multiscale kernels},
  journal      = {SIAM J. Numer. Anal.},
  fjournal     = {{SIAM} Journal on Numerical Analysis},
  volume       = {44},
  number       = {4},
  pages        = {1780-1800},
  year         = {2006},
}