ACKNOWLEDGEMENT 
Work for this paper has been supported by a number of 
grants. We acknowledge specifically the FWF For- 
schungsschwerpunkt S7003, the Akademie der Wis- 
senschaften with grant number 6070/16-1I/5/95, and 
the Bundesministerium für Wissenschaft, Forschung 
und Kunst with contract number 601.560/2-11/6/94. 
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