1. M.R. Anderson, “Nondestructive Testing of Offshore Structures,” NDT Int’l., 20 (1987), 17.
2. S. Evanson, M. Otaka, and K. Hasegawa, “SQUID NDE Apparatus and Magnetic Calibration to Detect Degradation in Duplex Stainless Steel,” J. Eng. Mat. and Tech., 114 (1992), p. 41.
3. L. Neel, Cahiers de Physique, 25 (1944), p. 21.
4. H.J. Williams, “Detection of Domain Magnetization in Powder Patterns,” Phys. Rev., 71 (1947), p. 646.
5. H.J. Williams, R.M. Bozorth, and W. Shockley, “Magnetic Domain Patterns on Single Crystals of Silicon Iron,” Phys. Rev., 75 (1949), p. 155.