References

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Wu, A. and W. W. Hsieh, 2004: The nonlinear Northern Hemisphere winter atmospheric response to ENSO, Geophys. Res. Lett., 31, L02203, doi:DOI 10.1029/2003GL018885.

Zadeh, L. A., 1965: Fuzzy sets, Information and Control, 8, 338-353.