BELLA, Giovanni. Multiple cycles and the Bautin bifurcation in the Goodwin model of a class struggle. Nonlinear Analysis: Modelling and Control, [S. l.], v. 18, n. 3, p. 265–274, 2013. DOI: 10.15388/NA.18.3.14009. Disponível em: https://journals.vu.lt./nonlinear-analysis/article/view/14009. Acesso em: 27 apr. 2025.