1. a Toshiba Kansai Research Laboratories, 8-6-26, Motoyama-Minarrei-Machi, Higashinada-ku, Kobe 658, Japan
2. b Toshiba Kansai Research Laboratories, 8-6-26, Motoyama-Minarrei-Machi, Higashinada-ku, Kobe 658, Japan
3. c Toshiba Kansai Research Laboratories, 8-6-26, Motoyama-Minarrei-Machi, Higashinada-ku, Kobe 658, Japan