Musikowski et al., “Welding unit for hollow section bolts—with magnetic flux shaping to produce field componensts radial to the bolt”, Derwent Information ltd., Acct. No. 1995-124084, pp. 1-2.* |
Oh, B., et al., “Multilevel YBaCuO Flux Transformers With High Tc SQUIDs: A Prototype High Tc SQUID Magnetometer Working at 77 K,” Applied Physics Letters, 59(1), pp. 123-125 (Jul. 1991). |
Tanaka, S., et al., “Properties of YBa2Cu3O7-y Large Washer SQUID,” Japanese Journal of Applied Physics, vol. 32, pp. L662-L664 (May 1993). |