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Katayose, Y. and Inoue, Y. and Kawasaki, Y. and Miyoshi, H. and Murakami, S. and Nakagawa, M. and Nakakoji, T. and Nakano, E. and Takahashi, T. and Teramoto, Y. (1998) A search for non-random cosmic-ray time series by a cluster analysis. Il nuovo cimento C, 21 C (3). pp. 299-316. ISSN 1826-9885