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1. H. Tsuchiya, and I. Hatakeyama,
   "Fusion Splices for Single-ModeOptical Fiber,"
   Technical Digestof Topical Meeting on 2nd Optical Fiber Transmission ,
   PD-1, Feb. 1977
   
   

2. N. Shimizu, and H. Tsuchiya,
   "Single-Mode Optical Fiber connectors,"
   Trans. IECE of Japan, vol. 62-C, No. 4, pp. 237-243, Apr. 1979.
   
   

3. H. Tsuchiya, and N. Imoto,
   "Dispersion-Free Single-Mode Fibre in 1.5ƒÊm wavelength Region,"
   Electron. Lett., vol. 15, No. 15 pp. 476-478, July. 1979.�@