The X-ray cycle in the solar-type star HD 81809 - XMM-Newton observations and implications for the coronal structureF. Favata, G. Micela, S. Orlando, J. H. M. M. Schmitt, S. Sciortino and J. HallA&A, 490 3 (2008) 1121-1126DOI: https://doi.org/10.1051/0004-6361:200809694
