Ro-vibrational energy analysis of Manning–Rosen and Pöschl–Teller potentials with a new improved approximation in the centrifugal termDebraj Nath and Amlan K. RoyEur. Phys. J. Plus, 136 4 (2021) 430DOI: https://doi.org/10.1140/epjp/s13360-021-01435-7