Enayati, Farideh, and Mohammad Sadegh Asgari. “On the Generalized Riesz-Dual Sequences in Hilbert Spaces”. Eurasian Mathematical Journal 8, no. 4 (December 30, 2017): 45–54. Accessed December 19, 2025. https://emj.enu.kz/index.php/main/article/view/679.