Magnitude-range brightness variations of overactive K giantsK. Oláh, A. Moór, Zs. Kővári, T. Granzer, K. G. Strassmeier, L. Kriskovics and K. VidaA&A, 572 (2014) A94DOI: https://doi.org/10.1051/0004-6361/201424695