On particle dynamics near the singularity inside the Schwarzschild black hole and T-spheres A. Radosz, A. V. Toporensky and O. B. Zaslavskii Eur. Phys. J. C, 83 7 (2023) 650 Published online: 23 July 2023 DOI: 10.1140/epjc/s10052-023-11827-x