MathSciNet bibliographic data MR382615 (52 #3497) 30A32 Barnard, Roger W. On the radius of starlikeness of $(zf)\sp{\prime}$$(zf)\sp{\prime}$ for $f$$f$ univalent. Proc. Amer. Math. Soc. 53 (1975), no. 2, 385–390. Article

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