1. Duesenberry, J.J., 1950, “Hicks on the trade cycle”, Quarterly Journal of Economics 64, pp. 464–476.
2. Figueiredo, R.J.P., de, 1958, Existence and Uniqueness of Periodic Solutions in Autonomous Oscillators, Unpublished Ph. Thesis, Harvard University, Cambridge, Mass., December.
3. Gabisch, G., Lorenz, H.-W., 1989, Business Cycle Theory. A Survey of Methods and Concepts, 2nd ed., Springer-Verlag, Berlin.
4. Gallegati, M., Gardini, L., Puu, T., Sushko, I., 2003, “Hicks’ trade cycle theory revisited: cycles and bifurcations”, Mathematics and Computers in Simulation 63, pp. 505–527.
5. Gandolfo, G., 1997, Economic Dynamics, Study ed., Springer-Verlag, Berlin.