11. Variation of the average penumbra-umbra ratio of sunspots during the solar cycle Creator: Dezsö, L. and Gerlei, O. Format: bez média and svazek Type: model:article and TEXT Subject: heliophysics, solar cycle, and penumbra-umbra ratio of sunspots Language: Czech Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
12. Západní Bengálsko - bašta indického komunismu? Creator: Holman, Jaroslav Format: print Type: model:internalpart and TEXT Language: Czech Rights: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public