TY  - JOUR
AU  - P. Ranzinger
AU  - M. Vukićević-Karabin
TI  - On the Structure and the Development of the Sunspot Group
JO  - Publications of the Department of Astronomy
PY  - 1974
SP  - 9 
EP  -  17
VL  - 5
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PDA_1974_5_1_a1/
ID  - PDA_1974_5_1_a1
ER  -