1. Ravi Kanth, A.S.V., Bhattacharya, V.: Cubic spline for a class of non-linear singular boundary value problems arising in physiology. Appl. Math. Comput. 174, 768–774 (2006)
2. Saad, A.S., Nouh, M.I., Shaker, A.A., Kamel, T.M.: Approximate analytical solutions to the relativistic isothermal gas sphere. Revista Mexicana de Astronomia y Astrofisica 53, 247–255 (2017)
3. Richardson, O.U.: The Emission of Electricity from Hot Bodies. Green and Co., London (1921)
4. Chowdhury, M.S.H., Hashim, I.: Solutions of a class of singular second-order IVPs by homotopy-perturbation method. Phys. Lett. A 365, 439–447 (2007)
5. Vanani, S.K., Aminataei, A.: On the numerical solution of differential equations of Lane–Emden type. Comput. Math. Appl. 59, 2815–2820 (2010)