Waswa, V., E. Jobunga, and P. Kariuki. “Electron Impact Elastic Scattering by a Calcium Atom Using the First Order Distorted Wave Method With a Complex Potential”. African Journal of Pure and Applied Sciences, Vol. 3, no. 2, Dec. 2022, pp. 247-54, doi:10.33886/ajpas.v3i2.298.