El-Sayed Ahmed A, Kamal A, Yassen T. Characterizations for certain analytic functions by series expansions with Hadamard gaps. CUBO [Internet]. 2014 Mar. 1 [cited 2024 Apr. 19];16(1):81–93. Available from: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1290