Coefficient Estimates for Meromorphic Bi-Univalent Functions
  A univalent meromorphic function defined on $\Delta:= \{z \in \mathbb{C}: 1<|z|<\infty \}$ with univalent inverse defined on $\Delta$ is bi-univalent meromorphic in $\Delta$. For certain subclasses of meromorphic bi-univalent functions, estimates on the initial coefficients are obtained. 
Suzeini Abd Halim, Samaneh G. Hamidi, V. Ravichandran
math.CV