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3. NCEP/NCAR, 40-year reanalysis project. Bulletin of the American Meteorological Society; 1998: data available at the website http://ingrid.ldgo.columbia.edu/sources in the catalogue of NOAA NCEP-NCAR CDAS-1 data sets.
4. E. Kalney, et al., The NCEP/NCAR 40-yr Bull. Am. Meteorol. Soc. 1996: available at the website quoted in [3].
5. B. Sørensen, Renewable Energy. 2nd Edition, Academic Press, London and San Diego, 2000, pp. 228–230.