1. Systèmes grossiers;Andronov;Dokl. Akad. Nauk. SSR,1937
2. Andronov, A., E. Leontovich, I. Gordon, and A. Maier, “Theory of Bifurcations of Dynamical Systems in the Plane,” Israel Program of Scientific Translations, 1971, Jerusalem.
3. Bernfeld, S., and L. Salvadori, Generalized Hopf bifurcation, Conference on Recent Advances in Differential Equations, Trieste, Italy (to appear).
4. Bernfeld, S., and L. Salvadori, Generalized Hopf bifurcation and h-asymptotic stability, J. of Nonl. Anal. T. M. A. (to appear).
5. Bernfeld, S., and L. Salvadori, Generic properties of h-asymptotically stable systems and Hopf bifurcation, (to appear).