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This work was completed while the first two authors were visiting at the University of Kentucky.
The research of the first author was partially supported by a College of Charleston research grant.
The second author was on a sabbatical leave from the University of California, Davis.
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Silverman, H., Silvia, E.M. & Telage, D. Convolution conditions for convexity, starlikeness and spiral-likeness. Math Z 162, 125–130 (1978). https://doi.org/10.1007/BF01215069
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DOI: https://doi.org/10.1007/BF01215069