Sashinka Wimaladharma, and Dinuka de Silva. “Some Solution Methods for Lane-Emden Differential Equation When the Polytropic Index Is Three”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 99, no. 1, Oct. 2024, pp. 1-12, https://asrjetsjournal.org/American_Scientific_Journal/article/view/11066.