Kaddar, A., and H. Talibi Alaoui. “Local Hopf Birurcation and Stability of Limit Cycle in a Delayed Kaldor-Kalecki Model”. Nonlinear Analysis: Modelling and Control, vol. 14, no. 3, July 2009, pp. 333-4, https://doi.org/10.15388/NA.2009.14.3.14499.