[1]
Godіch V. I., “On invariant subspaces of completely continuous bisymmetrical operators ”,
Ukr. Mat. Zhurn.
, vol. 18, no. 3, pp. 103–107, Apr. 1966, Accessed: Apr. 13, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/8742