• M. Golubitsky and P.H. Rabinowitz. A sketch of the Hopf bifurcation theorem. In: Selected Works of Eberhard Hopf with Commentaries. (C.S. Morawetz, J.B. Serrin and Y.G. Sinai, eds.) Amer. Math. Soc., Providence, 2002, 111-118. [PDF 137K]