1. IEC Standard 404–2.
2. D.C. Dieterly, ASTM Symp Mag Test -DC Perm Testing of Epstein samples, 1948, pp. 39–62.
3. P. Beckley, J.Z. Cao, G.H. Shirkoohi, IIT Conference on Magnetic Materials, Chicago, May 1998.
4. Z.S. Soghomonion, P. Beckley, A.J. Moses, ASTM Materials Week, Chicago, October 1994.
5. P. Beckley, J. Lodge, B.J. NDT. January 1997 pp. 19–20.