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Hall, M J; Drake, A E; Harmon, S A C; Ager, C I (1998) Low permeability reference standards with improved high magnetic field strength performance. IEE Proc. Sci. Meas. Technol., 145 (4). pp. 181-183.
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Hall, M J; Drake, A E; Harmon, S A C; Ager, C I (1997) Versatile low permeability reference standards with improved high magnetic field strength performance. In: BEMC '97 8th International Conference on Electromagnetic Measurement Digest, 4-6 November 1997, National Physical Laboratory, Teddington.
Drake, A E; Ager, C I (1993) The development and use of low magnetic permeability reference materials. In: 6th British Electromagnetic Measurements Conference Digest (BEMC 93), 2-4 November 1993, NPL, Teddington, UK.