1. O.H. Zinke and W.F. Schmidt, in IEEE Transactions on Magnetics, Vol.29, No. 5, September 1993.
2. O.H. Zinke and W.F. Schmidt, in Review of Progress in QNDE, Vol. 8, eds. D.O. Thompson and D.E. Chimenti (Plenum, New York, 1989), p. 2051.
3. W.F. Schmidt and O.H. Zinke, in Review of Progress in QNDE, Vol. 11, op. cit., (1992), p. 1663.
4. O.H. Zinke and W.F. Schmidt, in Review of Progress in QNDE, Vol. 15, op. cit., (1996), p. 2197.
5. W.F. Schmidt and O.H. Zinke, “Characterization of a Crack in an Aluminum Bar Using an AC Magnetic Bridge”, Special Applications and Advanced Techniques for Crack Size Determinations, ASTM STP 1251, p. 147, 1995.