PORIA, A. Semi-continuous $G$-frames in Hilbert spaces. Methods of Functional Analysis and Topology, [S. l.], v. 26, n. 3, p. 249–261, 2020. DOI: https://doi.org/10.31392/MFAT-npu26_3.2020.06. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/763. Acesso em: 15 dec. 2025.