Iterative solutions of the generalized diode equation

For original paper `Approximate analytical solution of generalized diode equation´ by T.A. Fjeldy et al. see ibid., vol.38, no.8, p.1976-7, Aug. 1991. The authors significantly enhanced the efficiency with which one may solve the generalized diode equation in numerical circuit simulation programs. This study concluded that Newton-Raphson iteration is relatively ill-suited for this task. To the contrary, the commenter finds that Newton´s method is comparable to that of Fjeldly et al. and discusses the merits of an alternative cubic step and two Newton steps