Khosravi, A., and S. Hosseini. “G-Frames and Operator Valued-Frames in Hilbert C*-Modules”. Methods of Functional Analysis and Topology 17, no. 1 (March 25, 2011): 10–19. Accessed December 16, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/466.