JOSHI, S., JOSHI, S. B., & MOHAPATRA, R. (2016). On a subclass of analytic functions for operator on a Hilbert space. Studia Universitatis Babeș-Bolyai Mathematica, 61(2), 147–153. Retrieved from https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5542