Performance of HTS Magnetic Shield for Highly-Sensitive Current Monitor with HTS SQUID       1992
  S. Watanabe, T. Ikeda, M. Kase, T. Katayama, T. Watanabe, RIKEN, Saitama      
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  Design of Highly-Sensitive Current Monitor with HTS SQUID and HTS Magnetic Shield       1995
  T. Watanabe, T. Ikeda, M. Kase, T. Katayama, S. Watanabe, RIKEN, Saitama; T. Kawaguchi, KT Science Ltd., Hyogo      
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