Ro-vibrational energies of CO molecule via improved generalized Pöschl–Teller potential and Pekeris-type approximationHilmi Yanar, Ahmet Taş, Mustafa Salti and Oktay AydogduEur. Phys. J. Plus, 135 3 (2020) 292DOI: https://doi.org/10.1140/epjp/s13360-020-00297-9