[1]
R. O. Bilichenko and V. F. Babenko, “Refinement of a Hardy–Littlewood–Pólya-type inequality for powers of self-adjoint operators in a Hilbert space”, Ukr. Mat. Zhurn., vol. 61, no. 10, pp. 1299–1305, Oct. 2009, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3101