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Chatzistergos, T. and Ermolli, I. and Falco, M. and Giorgi, F. and Guglielmino, S. L. and Krivova, N. A. and Romano, P. and Solanki, S. K. (2019) Historical solar Ca II K observations at the Rome and Catania observatories. Il nuovo cimento C, 42 (1). pp. 1-4. ISSN 1826-9885