1. Amemiya, A. 1938: See Kotani.
2. Inductive Coupling of a Homogeneous Ground with a Vertical Coil;Belluigi;Geophysics,1949
3. Electromagnetic Fields of a Vertical Magnetic Dipole Placed Above the Earth's Surface;Bhattacharyya;Geophysics,1963
4. The Principles & Practice of Geophysical Prospecting;Broughton Edge,1931