@article{Greenwood1979,
  title = {Probability weighted moments: Definition and relation to parameters of several distributions expressable in inverse form},
  volume = {15},
  ISSN = {1944-7973},
  url = {http://dx.doi.org/10.1029/WR015i005p01049},
  DOI = {10.1029/wr015i005p01049},
  number = {5},
  journal = {Water Resources Research},
  publisher = {American Geophysical Union (AGU)},
  author = {Greenwood,  J. Arthur and Landwehr,  J. Maciunas and Matalas,  N. C. and Wallis,  J. R.},
  year = {1979},
  pages = {1049–1054}
}

@article{Hosking1985,
  title = {Estimation of the Generalized Extreme-Value Distribution by the Method of Probability-Weighted Moments},
  volume = {27},
  ISSN = {1537-2723},
  url = {http://dx.doi.org/10.1080/00401706.1985.10488049},
  DOI = {10.1080/00401706.1985.10488049},
  number = {3},
  journal = {Technometrics},
  publisher = {Informa UK Limited},
  author = {Hosking,  J. R. M. and Wallis,  J. R. and Wood,  E. F.},
  year = {1985},
  pages = {251–261}
}