CitationSEVGİ, L. (2009). Testing ourselves. IEEE Antennas and Propagation Magazine, 51 (5), pp. 230-230. http://dx.doi.org/10.1109/MAP.2009.5432109.
In his EM Programmer's Notebook in the June 2009 issue of the Magazine, David B. Davidson presented a paper by Edward J. Rothwell  on the exponential approximations of some special functions, i.e., several ordinary and modified Bessel functions, which play a central role in numerical electromagnetic. Dr. Rothwell also included examples for diffraction by a circular aperture, radiation from an aperture antenna, transient reflection from Debye and Lorentz media, and scattering by a conducting strip.