JOSHI S, JOSHI SB, MOHAPATRA R. On a subclass of analytic functions for operator on a Hilbert space. Stud. Univ. Babeş-Bolyai Math. [Internet]. 2016 Jun. 30 [cited 2025 Feb. 5];61(2):147-53. Available from: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5542