“…For the case of the well-known approximate (also called reduced) kernel, the main difficulties arise from the fact that neither of the said integral equations has a solution; the important issue of "nonsolvability" is discussed in detail in [1]- [3]. Since 2001, the analysis of [1] has been extended in a number of directions, including the so-called "extended thin-wire kernel" [4], feeds other than the delta-function generator [5]- [8], loop antennas [9], [10], a similar equation of electrostatics [11], as well as antennas with finite conductivity, including carbon-nanotube antennas [12]. Furthermore, the analysis of [1] forms the foundation for the development of an easy-to-apply technique [11], [13]- [16] that is an a posteriori remedy for the most important difficulties.…”