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E. M. Goodman, B. Greenebaum, Michael T. Marron, Bioeffects of Extremely Low-Frequency Electromagnetic Fields: Variation with Intensity, Waveform, and Individual or Combined Electric and Magnetic Fields, Radiation Research, Vol. 78, No. 3 (Jun., 1979), pp. 485-501
Goodman et al. (Fri,) studied this question.