Wu, Xiaoqin P. P. “Triple-Zero Singularity of a Kaldor–Kalecki Model of Business Cycles With Delay”. Nonlinear Analysis: Modelling and Control 18, no. 3 (July 25, 2013): 359–376. Accessed July 18, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/14015.