%0 Journal Article
%A P. Ranzinger
%A M. Vukićević-Karabin
%T On the Structure and the Development of the Sunspot Group
%J Publications of the Department of Astronomy
%D 1974
%P 9 
%V 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PDA_1974_5_a1/
%G en
%F PDA_1974_5_a1