Measuring differential rotation of the K-giant ζ AndromedaeZs. Kővári, H. Korhonen, L. Kriskovics, K. Vida, J.-F. Donati, H. Le Coroller, J. D. Monnier, E. Pedretti and P. PetitA&A, 539 (2012) A50DOI: https://doi.org/10.1051/0004-6361/201118177