Supplementary Material
A. Meiners and H. Uecker, Helfrich cylinders - instabilities, bifurcations and amplitude equations, preprint, reference sheet for the sources
F. Al Saadi, E. Knobloch, A. Meiners and H. Uecker, Localised steady and oscillatory states near a Turing--Hopf instability in a semiconductor model. preprint, reference sheet for the sources.
A. Meiners and H. Uecker, Differential geometric bifurcation problems in pde2path -- algorithms and tutorial examples.