Vanlommel, P. ; Van der Linden, R.A.M. ; Robbrecht, E. ; Berghmans, D. ; Clette, F. ; Wauters, L. ; Zhukov, A.N. ; Cugnon, P.
published in Heelal, 49, pp. 79-86 (2004)
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Royal Observatory of Belgium > Solar Physics & Space Weather (SIDC)
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