Institution: | 1. Department of Mathematics and Statistics, Georgia State University, Atlanta, GA 30303, USA;2. Department of Mathematical Information Science, Tokyo University of Science, Shinjuku-Ku, Tokyo 162-8601, Japan;3. Department of Mathematics and Computer Science, Emory University, Atlanta, GA 30322, USA;4. Department of Computer Science, Nihon University, Sakurajosui 3-25-40, Setagaya-Ku, Tokyo 156-8550, Japan |