Camelo, Andr, Carlos Alberto Ram, and Guillermo Villa Mart. “On the Construction of Schauder Bases in Hilbert Spaces via Unitary Representations”. Statistics, Optimization & Information Computing 15, no. 4 (January 8, 2026): 2872–2889. Accessed May 1, 2026. https://www.iapress.org/index.php/soic/article/view/3187.