DAW, Shahawe, et al. “Generating Some Linear Second-Order Differential Equations With Undetermined Coefficients By Linearly Combining Frobenius And Legendre Differential Equations”. Journal of Pure & Applied Sciences , vol. 18, no. 3, May 2019, pp. 23-27, https://doi.org/10.51984/jopas.v18i3.246.