Analysis of evolution of NOAA 7912 active region on 19 October 1995P. Rudawy, L. van Driel-Gesztelyi, B. Cader-Sroka, P. Mein, N. Mein, B. Schmieder, J.-M. Malherbe and B. RompoltAstron. Astrophys. Suppl. Ser., 139 1 (1999) 89-96DOI: https://doi.org/10.1051/aas:1999382