1. O.H. Zinke and W.F. Schmidt, IEEE Transactions on Magnetics, Vol. 29, (1993), p. 2207–2212.
2. O.H. Zinke and W.F. Schmidt, in Review of Progress in QNDE, Vol. 13, Plenum Press, New York, (1994), p. 1825–1832.
3. O.H. Zinke, W.F. Schmidt, and J. Timothy Lovett, “Measurement of Thickness of Magnetite Layers Through Alloy 600,” submitted for publication in review of progress QNDE, Vol. 18, (1999).
4. W.F. Schmidt, O.H. Zinke, and S. Nasrazadani, Special Technical Paper, 1251, American Society for Testing and Materials, Philadelphia, (1955), p. 147–163.