Regular functions $f(z)$ for which $z f’(z)$ is $\alpha$-spiral

@inproceedings{Libera1972RegularF,
  title={Regular functions \$f(z)\$ for which \$z f’(z)\$ is \$\alpha\$-spiral},
  author={Richard J. Libera and Michael R. Ziegler},
  year={1972}
}

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