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Bütikofer, Rolf; Flückiger, Erwin; Desorgher, Laurent; Moser, Michael; Pirard, Benoît (2007). The cosmic ray ground level enhancement on 13 December 2006. In: Mavromichalaki, Helen; Papaioannou, Athanasios (eds.) Proceedings of the 3rd SEE 2007 International Symposium COSPAR Colloquium, Athens, Greece, 24-27 September 2007. Athens: National and Kapodistrian University of Athens
Flückiger, Erwin (2007). Characteristics of the cosmic ray ground level enhancements on January 20, 2005, and December 13, 2006, as obtained from world-wide neutron monitor data. In: Mavromichalaki, Helen; Papaioannou, Athanasios (eds.) Proceedings of the 3rd SEE 2007 International Symposium COSPAR Colloquium, Athens, Greece, 24-27 September 2007. Athens: National and Kapodistrian University of Athens
Flückiger, Erwin; Bütikofer, Rolf; Pirard, Benoît; Desorgher, Laurent (2007). The Swiss Neutron Monitors. In: Mavromichalaki, Helen; Papaioannou, Athanasios (eds.) Proceedings of the 3rd SEE 2007 International Symposium COSPAR Colloquium, Athens, Greece, 24-27 September 2007. Athens: National and Kapodistrian University of Athens
