Published in
Hans Publishers, Astronomy & Astrophysics, (599), p. A131
DOI: 10.1051/0004-6361/201629533
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Wings of the butterfly: Sunspot groups for 1826–2015
Journal article published in 2017 by
R. Leussu,
I. G. Usoskin 
,
V. Senthamizh Pavai,
A. Diercke,
R. Arlt,
C. Denker,
K. Mursula
,
V. Senthamizh Pavai,
A. Diercke,
R. Arlt,
C. Denker,
K. Mursula
This paper is available in a repository.
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