A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091) S. Boro Saikia, S. V. Jeffers, J. Morin, P. Petit, C. P. Folsom, S. C. Marsden, J.-F. Donati, R. Cameron, J. C. Hall, V. Perdelwitz et al. (2 more) A&A, 594 (2016) A29 Published online: 06 October 2016 DOI: 10.1051/0004-6361/201628262