@article{xiong_2020, title={The zeros of f^{n}f^(k)-a and normal families of meromorphic functions}, volume={51}, url={https://journals.math.tku.edu.tw/index.php/TKJM/article/view/3041}, DOI={10.5556/j.tkjm.51.2020.3041}, abstractNote={<p>In this paper, we first prove that if f be a non-constant meromorphic function, all of whose zeros have multiplicity at least $k$, then f^{n}f^{(k)}-a has at least m+1 distinct zeros, where $k(\geq2),m(\geq1),n(\geq m+1)$ are three integers, and $a\in \mathbb{C}\cup\setminus\{0\}$.Also, in relation to this result, a normality criteria is given, which extends the related result.</p>}, number={2}, journal={Tamkang Journal of Mathematics}, author={xiong, sun}, year={2020}, month={Jun.}, pages={137-144} }