• The impedance of a coil placed on a conducting plane 

    Russell, T.J.; Schuster. V.E.; Waidelich, D.L. (University of Missouri, 1963)
    "Probe coils are useful in determining the properties of metals on which the coil is placed. An analysis and an equivalent circuit of the coil on a metal surface are needed and are presented here. The coil was assumed to ...