Magnetic Evolution of a Long-Lived Active Region: The Sources of Magnetic Helicity
Proceedings article published in 2001 by
C. H. Mandrini,
Mandrini C ~H,
L. van Driel-Gesztelyi,
D. T. Wickramasinghe,
P. Démoulin,
L. Driel Gesztelyi,
G. Aulanier,
B. Thompson,
S. Plunkett,
Z.-S. Kövári 
,
S. K. Solanki
,
S. K. Solanki
