Tykhonenko, Dmytro, et al. “Improvement of Characterization Inequality for Norms Of  φ-Sub-Gaussian Random Variable”. Bulletin of Taras Shevchenko National University of Kyiv. Physics and Mathematics, vol. 81, no. 2, Dec. 2025, pp. 82-86, https://doi.org/10.17721/1812-5409.2025/2.10.