[1]
Y. S. Samoilenko and A. V. Strelets, “On ‘good’ vectors for family of unbounded operators and their application”, MFAT, vol. 8, no. 2, pp. 88–100, Jun. 2002, Accessed: Feb. 04, 2026. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/186