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Muraki, Yasushi; Matsubara, Yutaka; Masuda, Katoshi; Sako, Takashi; Sakakibara, Shizuko; Watanabe, Kyoko; Flückiger, Erwin; Bütikofer, Rolf; Chilingarian, Ashot; Hovsepyan, G; Kakimoto, Fumio; Terasawa, Toshio; Veralde, Alfonso; Sakai, Takasuke (2008). Detection of high-energy solar neutrons and protons by ground level detectors on April 15, 2001. Astroparticle physics, 29(4), pp. 229-242. Amsterdam: Elsevier 10.1016/j.astropartphys.2007.12.007