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1. ’†�ì�´Ži�C‘Š“cˆê•v�C�ŠCŒb”V�C
   �u’·”g’·‘уOƒŒ�[ƒfƒbƒhŒ`ŒõƒP�[ƒuƒ‹“`‘—Œn‚ÌŽÀŒ±“IŒŸ“¢�v
   “dŽq’Ê�MŠw‰ï˜_•¶Ž��CVol. 62-B, No. 8, pp. 736-743 (1979.8)..
   
   

2. Kiyoshi Nakagawa, Yoshiro Hakamada, Koh-ichi Suto, and Takeshi Ito,
   �g400 Mb/s Optical Repeater Design and Performance,�h
   The Transactions of the IECE of Japan,
   Vol. E 65, No. 11, pp.657-664 (Nov. 1982).
   
   

3. Kiyoshi Nakagawa, Shigendo Nishi, Kazuo Aida, and Etsugo Yoneda,
   �gTrunk and Distribution Network Application of Erbium-Doped Fiber
   Amplifier,�h IEEE Journal of Lightwave Technology, Vol.9, No.2,
   pp.198-208 (Feb. 1991).