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Authors: Koubkova, A.; Koubek, V.
Document Type: Short Communication
Affiliations: 1The second author gratefully acknowledges the support of the project LN00A056 of The Ministry of Education of the Czech Republic.Department of Software Engineering, Faculty of Mathematics and Physics, Charles University, Malostranske nam.25, 11800 1, Praha, Czech Republic
Publication date: March 31, 2002