Affiliation: | 1. Department of Mathematics, NTIS, New Technologies for the Information Society, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic 2. CE-ITI, European Center of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic 3. Department of Mathematics and Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto, 860-8555, Japan 4. Department of Mathematics, College of Science and Technology, Nihon University, Tokyo, 101-8308, Japan
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