[[1] SCHINASI, G. J.: Fluctuations in a dynamic, intermediate-run IS-LM model: applicationsof the Poincar´e-Bendixon theorem, J. Econom. Theory 28 (1982), 369-375.10.1016/0022-0531(82)90068-0]Search in Google Scholar
[[2] KALDOR, N.: A model of the trade cycle, Economic J. 50 (1940), 69-86.]Search in Google Scholar
[[3] LIU, W. M.: Criterion of Hopf bifurcations without using eigenvalues, J. Math. Anal. Appl. 182 (1994), 250-256.10.1006/jmaa.1994.1079]Search in Google Scholar
