原　　宏

1. Ko Hara, Takeshi Kobayashi, Toshimi Matsui, Takahiro Nagase and Genta Yonezaki;
   Japnese Journal of Applied Physics Vol.10, No.8, pp.1066-1076, 1971
   Stark Voltmeter as an Electromotive Force Reference.
   
   

2. Masakazu Nakanishi and Ko Hara;
   Japanese Journal of Applied Physics Vol.23, No.5, pp.L321-L323 1984
   Composite Josephson Device.
   
   

3. K. Hara; Metrologia, 31, 441-446, 1994/95
   Progress of Electricity Standards in Japan
   ( Amalgamation of Electricity and Mass Standards)