Short-term variability on the surface of (1) Ceres A changing amount of water ice? - Perna, D.; Kaňuchová, Z.; Ieva, S.; Fornasier, S.; Barucci, M. A.; Lantz, C.; Dotto, E.; Strazzulla, G. (Astronomy & Astrophysics / Astronomie et Astrophysique, 2015)