1. W.F. Schmidt and O.H. Zinke, Review of Progress in QNDE, Vol 12, eds. by D.O. Thompson and D.E. Chimenti, (Plenum Press, New York, 1993), p. 1885.
2. W.F. Schmidt and O.H. Zinke, Review of Progress in QNDE, Vol 13, eds. by D.O. Thompson and D.E. Chimenti, (Plenum Press, New York, 1994), p. 1825.
3. O.H. Zinke, U.S. Patent #4,901,017 (February 13, 1990), Canadian Patent #1296061 (February 18, 1992), European Common Market Patent #0329781, (March 29, 1995).
4. M.R. Woodward, H.A. Sreshta, O.H. Zinke, and W.F. Schmidt, “Surface Flaws Using a Modified AC Magnetic Bridge”, Experimental Mechanics, Vol. 35, Society of Experimental Mechanics, December, 1995, p. 367.
5. W.F. Schmidt, O.H. Zinke, and S. Nasrazadani,“Characterization of a Crack in an Aluminum Bar Using an AC Magnetic Bridge”, 147–163, Special Technical Paper 1251, American Society of Testing and Materials, ASTM, Philadelphia, PA, April, 1995.