E. P. INYANG, I. O. Akpan, E. P. Inyang, and E. S. William, “Approximate solutions of the Schrödinger equation with Hulthén-Hellmann Potentials for a Quarkonium system”, Rev. Mex. Fís., vol. 67, no. 3 May-Jun, pp. 482–490, May 2021.