Europe, in State of the Climate in 2011.
Trachte K., Obregón A., Bissolli P., Trigo R., Barriopedro D., Gouveia C. and Parker D.E.
Bulletin of the American Meteorological Society, 93 (7), S186-S199
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http://journals.ametsoc.org/doi/pdf/10.1175/2012BAMSStateoftheClimate.1
Abstract