1. Auroral Substorms Paradigm Shifts in Research
2. Some problems concerning the morphology of auroras and magnetic disturbances at high latitudes;Feldstein Y. I.;Geomagn. Aeron.,1963
3. President's address, 1892–93;Kelvin W. T.;Proc. R. Soc.,1892
4. Tromholt S.(1882) Om nordlysets perioder/Sur les périodes de l'aurore boréale l'annuaire 1880 Inst. Météorol. Danois Copenhagen.