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1. Evidence for the prolonged existence of >100 MeV solar protons in coronal structures A. Struminskii https://doi.org/10.1134/1.1626194
2. Current views on impulsive and gradual solar energetic particle events M. Kallenrode https://doi.org/10.1088/0954-3899/29/5/316
3. On energetic particles in space K. Kudela https://doi.org/10.2478/v10155-010-0098-4
4. Enhanced diurnal variation and Forbush decreases recorded with Lead-Free Gulmarg Neutron Monitor during the solar active period of late October 1989 S. Mufti et al. https://doi.org/10.1016/j.pss.2011.01.005
5. VARIATIONS OF THE MUON FLUX AT SEA LEVEL ASSOCIATED WITH INTERPLANETARY ICMEs AND COROTATING INTERACTION REGIONS C. Augusto et al. https://doi.org/10.1088/0004-637X/759/2/143