... Principle1
A preleminary version of the paper was presented at the 16th annual IEEE Conference on Computational Complexity, June 2001
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... Dantchev2
Most of the work has been done while working at BRICS (Basic Research In Computer Science, Centre of the Danish National Research Foundation), Dept. of Computer Science, University of Aarhus and visiting Dept. of Computer Science, Queen Mary, University of London
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