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JUCS - Journal of Universal Computer Science 6(1): 155-168
doi:
10.3217/jucs-006-01-0155
Published:
28 Jan 2000
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Author
Hajime Ishihara 
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School of Information Science Japan Advanced Institute of Science and Technology, Nomi, Ishikawa, Japan
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Conflict of interest
The author has declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.