@inbookDellnitz_Golubitsky_Melbourne_1992, place=Basel, title=Mechanisms of Symmetry Creation, DOI=10.1007/978-3-0348-7536-3_9, booktitle=Bifurcation and Symmetry, author=Dellnitz, Michael and Golubitsky, Martin and Melbourne, Ian, year=1992 

@inbookDellnitz_Marsden_Melbourne_Scheurle_1992, place=Basel, title=Generic Bifurcations of Pendula, DOI=10.1007/978-3-0348-7536-3_10, booktitle=Bifurcation and Symmetry, author=Dellnitz, Michael and Marsden, Jerrold E. and Melbourne, Ian and Scheurle, Jürgen, year=1992