MathSciNet bibliographic data MR291433 30A32 Libera, Richard J.; Ziegler, Michael R. Regular functions $f(z)$$f(z)$ for which $zf\sp{\prime} (z)$$zf\sp{\prime} (z)$ is $\alpha$$\alpha$-spiral. Trans. Amer. Math. Soc. 166 (1972), 361–370. Article

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