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The Lehtinen-Pirjola method modified for efficient modelling of geomagnetically induced currents in multiple voltage levels of a
power network; Pirjola, R J; Boteler, D H; Tuck, L; Marsal, S. Annales Geophysicae vol. 40, issue 2, 2022 p. 205-215,
https://doi.org/10.5194/angeo-40-205-2022 
Open Access
(NRCan Cont.# 20210276)