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Truncation of the Earth impulse responses relating geoelectric fields and geomagnetic field variations; Pirjola, R J;
Boteler, D H. Geosciences Research vol. 2, no. 2, 2017 p. 72-92,
https://doi.org/10.22606/gr.2017.22002 
Open Access (ESS
Cont.# 20160135)