Ifidon, E. O., and E. O. Oghre. “Some Conservative Force Field Potentials In Scattering Theory”. Journal of the Nigerian Mathematical Society 32, no. 1-3 (April 8, 2021): 171–183. Accessed April 27, 2024. https://ojs.ictp.it/jnms/index.php/jnms/article/view/691.