Institution: | 1. Department of Mathematics, Faculty of Science, Niigata University, Niigata, 950-2181, Japan 2. Computer Science Laboratory, Fukuoka Institute of Technology, 3-30-1, Wajiro-Higashi, Higashi-ku, Fukuoka, 811-0295, Japan 3. Graduate School of Science and Technology, Niigata University, Niigata, 950-2181, Japan
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