Morris Marden, On the Zeros of Rational Functions Having Prescribed Poles, with Applications to the Derivative of an Entire Function of Finite Genre, Transactions of the American Mathematical Society, ...

Extending a result of Khavinson and $\acute {S}wi\cedil {a}tek$ (2003) we show that the rational harmonic function $\overline {r (z)} - z$, where r (z) is a rational function of degree n > 1, has no ...