1. P. G. Bakker. On the topology of three-dimensional separations, a guide for classification. In D. Roose, editor, Continuation and Bifurcations: Numerical Techniques and Applications, pages 297–318. Klüwer, Dordrecht, 1990.
2. P. G. Bakker. Bifurcations in Flow Patterns. Klüver Academic Publishers, Dordrecht, 1991.
3. M. Brøns. Topological fluid dynamics of interfacial flows. Physics of Fluids, 6(8):2730–2737, 1994.
4. M. Brøns. Topological fluid mechanics with applications to free surfaces and ax-isymmetric flows. Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM), 76 suppl. 5:73–74, 1996.
5. S.-N. Chow, C. Li, and D. Wang. Normal Forms and Bifurcation of Planar Vector Fields. Cambridge University Press, 1994.