@article{6244,
  author = {Andrew Hamilton},
  title = {Towards optimal measurement of power spectra - II. A basis of positive, compact, statistically orthogonal kernels},
  year = {1997},
  journal = {Monthly Notices of the Royal Astronomical Society},
  volume = {289},
  pages = {295-304},
  url = {http://mnras.oxfordjournals.org/content/289/2/295.full.pdf},
}