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Usoskin, Ilya G.; Desorgher, Laurent; Velinov, Peter; Storini, Marisa; Flückiger, Erwin O.; Bütikofer, Rolf; Kovaltsov, Gennady A. (2009). Ionization of the earth's atmosphere by solar and galactic cosmic rays. Acta geophysica, 57(1), pp. 88-101. Warszawa: Versita 10.2478/s11600-008-0019-9
