Usoskin, I. G.; Mironova, I. A.; Korte, M.; Kovaltsov, G. A. (2010): Regional millennial trend in the cosmic ray induced ionization of the troposphere. Journal of Atmospheric and Solar-Terrestrial Physics, 72, 1, 19-25.
Usoskin, I. G.; Korte, M.; Kovaltsov, G. A. (2008): Role of centennial geomagnetic changes in local atmospheric ionization. Geophysical Research Letters, 35, L05811.