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- Andrzej Skowron
- Institute of Mathematics, Warsaw University, Warsaw, Poland. e-mail: skowron@mimuw.edu.pl
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- Lech Polkowski
- Institute of Mathematics, Warsaw University of Technology, Warsaw, Poland. e-mail:mltpolk@plwatu21.bitnet
収録刊行物
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- Fundamenta Informaticae
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Fundamenta Informaticae 30 (3,4), 345-358, 1997
IOS Press