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We show that there is a sequence of zeros of R (s) in the fourth quadrant. We show that the n-th zero -₍=-₍+i-₍, with -₍ 4² n/²n and -₍-4 n/ n. We give the first terms of an asymptotic development of -₍ and an algorithm to calculate -₍ from n.
Juan Arias de Reyna (Mon,) studied this question.