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2. A Theory of Magnetic Storms and Aurorae, II, III;Alfvén;Kungl. Sv. Vetenskapsakad. Handl. (3),1940
3. On the Solar Origin of Cosmic Radiation;Alfvén;Phys. Rev.,1949
4. On the Solar Origin of Cosmic Radiation, II;Alfvén;Kungl. Sv. Vetenskapsakad. Handl. (3),1950