Ferrara, Massimiliano, Luca Guerrini, and Mauro Sodini. “Stability and Nonlinear Dynamics in a Solow Model With Pollution”. Nonlinear Analysis: Modelling and Control 19, no. 4 (July 7, 2014): 565-577. Accessed July 7, 2022. https://www.journals.vu.lt/nonlinear-analysis/article/view/13654.