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The kernel of the Cooray-Rubinstein formula in the time domain involves a modified Bessel function of order zero. In this letter, approximations of the kernel are proposed, which do not use any special function, and, hence, are able to simplify the numerical evaluation in view of lightning-induced voltages calculations.
Mario Paolone, André Hodder, Simone Rametti, Lucien André Félicien Pierrejean