TY  - RPRT
TI  - Quiet geomagnetic field representation for all days and latitudes
AU  - W.H. Campbell
AU  - E.R. Schiffmacher
AU  - B.R. Arora
PY  - 1992
DO  - 10.5636/jgg.44.459
UR  - https://pubs.usgs.gov/publication/70016860
ID  - 70016860
ER  -