1. The lower limit of latitude (U.S. sector) of northern quiet auroral ares and its relation to Dst(H);Akasofu;J. Atmos. Terr. Phys.,1963
2. Albertson, V. D., Tripathy, S. C., and Clayton, R. E. (1970) Electric power systems and geomagnetic disturbances. Presented at the 1970 Midwest Power Symposium, Ames, Iowa, October 1970.
3. “The Aurora Borealis,”;Angot,1897
4. Low auroras;Nature (London),1933