• A. Vanderbauwhede, M. Krupa and M. Golubitsky. Secondary bifurcations in symmetric systems. In: Differential Equations,. (C.M. Dafermos, G. Ladas and G. Papanicolaou, eds.) Lect. Notes Pure Appl. Math. 118 Marcel Dekker, Inc., New York, 1989, 709-716. [PDF 324K]