Magnetic field structure in single late-type giants: The weak G-band giant 37 Comae from 2008 to 2011S. Tsvetkova, P. Petit, R. Konstantinova-Antova, M. Aurière, G. A. Wade, A. Palacios, C. Charbonnel and N. A. DrakeA&A, 599 (2017) A72DOI: https://doi.org/10.1051/0004-6361/201527034