by Kajiki, Yoshinori, Matsushita, Kenji, Shimizu, Eiji
Published in Japanese Journal of Applied Physics (01.07.1990)

by Takahashi, Hideya, Shimizu, Eiji, Kajiki, Yoshinori
Published in Electronics & communications in Japan. Part 1, Communications (01.05.1995)

by Kajiki, Yoshinori, Takahashi, Hideya, Matsushita, Kenji, Shimizu, Eiji
Published in Electronics & communications in Japan. Part 2, Electronics (1990)