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- Y. Sakagawa, T. Mizusawa, N. Shiono
NTT Electrical Communications Laboratories, Wakamiya, Ibaraki, Japan
- Y. Hirao, K. Sato, M. Sekiguchi, I. Sugai
University of Tokyo, Tokyo, Japan
- J. Nishimura
Institute of Space and Astronautical Science, Tokyo, Japan
- T. Hattori
Tokyo Institute of Technology, Tokyo, Japan
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