1. G. Nicolis and I.Prigogine: “Selforganization in Nonequlibrium Systems”, Wiley (1977)
2. H. Haken, “Synergetics” and “Advanced Synergetics”, Springer (1983)
3. R. Thorn, “Structural Stability and Morphogenesis”, Benjamin (1975)
4. M. Golubitsky and W. Langford, J. Diff. Equs. 41, 375 (1981)
5. I. Labouriau, in Ref. [7]