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The Digital Database of Long-Term Solar Chromospheric Variation. - Reizaburo Kitai; Satoru UeNo; Hiroyuki Maehara; S. Shirakawa; M. Katoda; Y. Hada; Y. Tomita; H. Hayashi; A. Asai; Hiroaki Isobe; H. Goto; S. Yamashita (Data Sci. J., 2013)