MathSciNet bibliographic data MR984814 (90c:30042) 30D15 (30C15 30D20) Sheil-Small, T. On the zeros of \$L'+L\sp 2\$$L'+L\sp 2$ for certain rational functions \$L\$$L$. Proc. Amer. Math. Soc. 107 (1989), no. 4, 1013–1016. Article

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