X(5) Critical symmetry with inverse square potential via a variational procedureK. R. Ajulo, K. J. Oyewumi, O. S. Oyun and S. O. AjibadeEur. Phys. J. Plus, 137 1 (2022) 90DOI: https://doi.org/10.1140/epjp/s13360-021-02276-0