Peculiar Active Regions during the Last Two Solar Cycles López Fuentes, M. C. ; Mandrini, C. H. ; Démoulin, P. ; van Driel-Gesztelyi, L. Abstract Publication: Revista Mexicana de Astronomia y Astrofisica Conference Series Pub Date: 2002 Bibcode: 2002RMxAC..14R.107L