Nonstatic Reissner–Nordström metric in the perturbative f(R) theory: embedding in the background of the FLRW cosmology, uniqueness of solutions, the TOV equationPham Van KyEur. Phys. J. C, 85 2 (2025) 170DOI: https://doi.org/10.1140/epjc/s10052-025-13898-4