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JUCS - Journal of Universal Computer Science 1(5): 252-268
doi:
10.3217/jucs-001-05-0252
Published:
28 May 1995
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Authors
Erzsebet Csuhaj-Varju
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Computer and Automation Institute of the Hungarian Academy of Sciences, Budapest, Hungary
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Institute of Mathematics of the Romanian Academy, Bucharest, Romania
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Academy of Finland and University of Turku, Department of Mathematics, Turku, Finland
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.