My research has been sponsored by SJFR, NFR, SNV, and the EC. This chapter has benefitted from my introduction to this area of research by C.-O. Tamm and many discussions with D. Binkley, R. Giesler, H. Grip, M. Hogberg, H.-O. Nohrstedt, and T. Nasholm. I thank E.-D. Schulze for the kind invitation to write this chapter.
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