TY  - RPRT
TI  - Geomagnetic activity and Hale sector boundaries
AU  - Lundstedt, H.
AU  - Scherrer, P. H.
AU  - Wilcox, J. M.
PY  - 1981
UR  - https://ntrs.nasa.gov/citations/19810040984
ID  - 19810040984
ER  -